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Que: What is the standard deviation of four numbers a, b, c, and d?
Que: What is the standard deviation of four numbers a, b, c, and d?
(1) Sum of a, b, c, and d is 24.
(2) Sum of squares of a, b, c, and d is 240.
- by Max@Math Revolution
Sun Aug 08, 2021 8:43 pm- Forum: Data Sufficiency
- Topic: Que: What is the standard deviation of four numbers a, b, c, and d?
- Replies: 1
- Views: 254
Que: A pen company manufactures two types of the pen: Pen A and Pen B. The company manufactures 200 ‘type A’ ...........
Problem Solving
Re: Que: A pen company manufactures two types of the pen: Pen A and Pen B. The company manufactures 200 ‘type A’ .......
Solution: 50 percent of pens: \(\frac{50}{100}\cdot200=100\) => In 2015, type A pen = 200 => Type B pen = 0 => In 2016, type A pen = 200 – 50 = 150 => Type B pen = 75 => In 2017, type A pen = 150 – 50 = 100 => Type B pen = 75 + 75 = 150 => In 2018, type A pen = 100 – 50 = 50 => Type B pen = 225 The...
- by Max@Math Revolution
Sun Aug 08, 2021 8:40 pm- Forum: Problem Solving
- Topic: Que: A pen company manufactures two types of the pen: Pen A and Pen B. The company manufactures 200 ‘type A’ ...........
- Replies: 1
- Views: 215
Que: The cost of a certain phone call was $3 for the first 4 minutes and $0.20 for each additional...
Data Sufficiency
Re: Que: The cost of a certain phone call was $3 for the first 4 minutes and $0.20 for each additional...
Solution: To save time and improve accuracy on DS questions in GMAT, learn and apply the Variable Approach. Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem....
- by Max@Math Revolution
Sun Aug 08, 2021 8:37 pm- Forum: Data Sufficiency
- Topic: Que: The cost of a certain phone call was $3 for the first 4 minutes and $0.20 for each additional...
- Replies: 1
- Views: 201
Que: A pen company manufactures two types of the pen: Pen A and Pen B. The company manufactures 200 ‘type A’ ...........
Problem Solving
Que: A pen company manufactures two types of the pen: Pen A and Pen B. The company manufactures 200 ‘type A’ ...........
Que: A pen company manufactures two types of the pen: Pen A and Pen B. The company manufactures 200 ‘type A’ pens at the beginning of 2015. At the end of each year, starting with 2015, the company retired 50 of the ‘type A’ pens and acquired 75 new ‘type B’ pens. How many years did it take before t...
- by Max@Math Revolution
Sat Aug 07, 2021 10:52 pm- Forum: Problem Solving
- Topic: Que: A pen company manufactures two types of the pen: Pen A and Pen B. The company manufactures 200 ‘type A’ ...........
- Replies: 1
- Views: 215
Que: The cost of a certain phone call was $3 for the first 4 minutes and $0.20 for each additional...
Data Sufficiency
Que: The cost of a certain phone call was $3 for the first 4 minutes and $0.20 for each additional...
Que: The cost of a certain phone call was $3 for the first 4 minutes and $0.20 for each additional minute after the first 4 minutes. Did the phone call last longer than 8 minutes?
(1) The cost of the phone call was greater than $5.00.
(2) The cost of the phone call was less than $5.00.
- by Max@Math Revolution
Sat Aug 07, 2021 10:49 pm- Forum: Data Sufficiency
- Topic: Que: The cost of a certain phone call was $3 for the first 4 minutes and $0.20 for each additional...
- Replies: 1
- Views: 201
Que: A book to be reprinted has 300 numbers of pages to be typed, of which 80 were revised only once, ....
Problem Solving
Re: Que: A book to be reprinted has 300 numbers of pages to be typed, of which 80 were revised only once, ....
Solution: Total number of pages = 300 => Revised once: 80 => Revised twice: 50 => Remaining: 300 – (80 + 50) = 170 => Rate for first typing: $10 => Rate for first revised: $5 => Rate for second revised: $5 + $5 = $10 => Total cost = (170 * 10) + (80 * 5) + (50 * 8) = 1700 + 400 + 400 = $2,500 There...
- by Max@Math Revolution
Sat Aug 07, 2021 10:46 pm- Forum: Problem Solving
- Topic: Que: A book to be reprinted has 300 numbers of pages to be typed, of which 80 were revised only once, ....
- Replies: 1
- Views: 239
Re: Que: If ‘p’ and ‘q’ are integers, what is the value of p?
Solution: To save time and improve accuracy on DS questions in GMAT, learn and apply the Variable Approach. Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem....
- by Max@Math Revolution
Sat Aug 07, 2021 10:44 pm- Forum: Data Sufficiency
- Topic: Que: If ‘p’ and ‘q’ are integers, what is the value of p?
- Replies: 1
- Views: 197
Que: A book to be reprinted has 300 numbers of pages to be typed, of which 80 were revised only once, ....
Problem Solving
Que: A book to be reprinted has 300 numbers of pages to be typed, of which 80 were revised only once, ....
Que: A book to be reprinted has 300 numbers of pages to be typed, of which 80 were revised only once, 50 were revised twice, and the rest has no revisions. The typing service agency charges $10 per page if the page is typed for the first time and $5 per page each time a page is revised. How much do...
- by Max@Math Revolution
Thu Aug 05, 2021 8:25 pm- Forum: Problem Solving
- Topic: Que: A book to be reprinted has 300 numbers of pages to be typed, of which 80 were revised only once, ....
- Replies: 1
- Views: 239
Que: If ‘p’ and ‘q’ are integers, what is the value of p?
Que: If ‘p’ and ‘q’ are integers, what is the value of p?
(1) \(\frac{p}{q\ }=\frac{1}{3}\).
(2) \(q<0\ and\ p<0\).
- by Max@Math Revolution
Thu Aug 05, 2021 8:22 pm- Forum: Data Sufficiency
- Topic: Que: If ‘p’ and ‘q’ are integers, what is the value of p?
- Replies: 1
- Views: 197
Re: Que: Find the number of keystrokes required to type numbers from 1 to 900?
Solution: The number range is from 1 to 900. One digit numbers = 1 to 9 = 9 [Will need 1 key stroke each] = 9 key strokes Two digit numbers = 10 to 99 [Will need 2 key stroke each] = 90 * 2 = 180 key strokes Three digit numbers = 100 to 900 [Will need 3 key stroke each] = 801 * 3 = 2403 key strokes...
- by Max@Math Revolution
Thu Aug 05, 2021 8:16 pm- Forum: Problem Solving
- Topic: Que: Find the number of keystrokes required to type numbers from 1 to 900?
- Replies: 1
- Views: 240
Re: Que: If xy = 8, is x < y?
Solution: To save time and improve accuracy on DS questions in GMAT, learn and apply the Variable Approach. Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem....
- by Max@Math Revolution
Thu Aug 05, 2021 8:14 pm- Forum: Data Sufficiency
- Topic: Que: If xy = 8, is x < y?
- Replies: 1
- Views: 244
Que: Find the number of keystrokes required to type numbers from 1 to 900?
Que: Find the number of keystrokes required to type numbers from 1 to 900?
(A) 2,583
(B) 2,589
(C) 2,590
(D) 2,592
(E) 2,593
- by Max@Math Revolution
Mon Jul 19, 2021 11:33 pm- Forum: Problem Solving
- Topic: Que: Find the number of keystrokes required to type numbers from 1 to 900?
- Replies: 1
- Views: 240
- by Max@Math Revolution
Mon Jul 19, 2021 11:31 pm- Forum: Data Sufficiency
- Topic: Que: If xy = 8, is x < y?
- Replies: 1
- Views: 244
Que: A color “code” is defined as a sequence of four dots arranged in a row. Each dot is .....
Problem Solving
Re: Que: A color “code” is defined as a sequence of four dots arranged in a row. Each dot is .....
Solution: The first dot can use Blue or Green, the second dot also can use Blue or Green, the third dot also can use Blue or Green and the Fourth dot also can use Blue or Green, so 2 * 2 * 2 * 2 = 16
Therefore, D is the correct answer.
Answer D
- by Max@Math Revolution
Mon Jul 19, 2021 11:28 pm- Forum: Problem Solving
- Topic: Que: A color “code” is defined as a sequence of four dots arranged in a row. Each dot is .....
- Replies: 1
- Views: 212
Que: If P, Q, & R are numbers on the number line, not necessarily in that order, is ....
Data Sufficiency
Re: Que: If P, Q, & R are numbers on the number line, not necessarily in that order, is ....
Solution: To save time and improve accuracy on DS questions in GMAT, learn and apply the Variable Approach. Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem....
- by Max@Math Revolution
Mon Jul 19, 2021 11:25 pm- Forum: Data Sufficiency
- Topic: Que: If P, Q, & R are numbers on the number line, not necessarily in that order, is ....
- Replies: 1
- Views: 219