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Que: A color “code” is defined as a sequence of four dots arranged in a row. Each dot is .....
Problem Solving
Que: A color “code” is defined as a sequence of four dots arranged in a row. Each dot is .....
Que: A color “code” is defined as a sequence of four dots arranged in a row. Each dot is colored either “blue” or “green.” How many distinct codes can be formed?
(A) 2
(B) 4
(C) 8
(D) 16
(E) 32
- by Max@Math Revolution
Mon Jul 19, 2021 1:22 am- 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: 211
Que: If P, Q, & R are numbers on the number line, not necessarily in that order, is ....
Data Sufficiency
Que: If P, Q, & R are numbers on the number line, not necessarily in that order, is ....
Que: If P, Q, & R are numbers on the number line, not necessarily in that order, is |P − R| \(\ge\) 18?
(1) |P − Q| = 80.
(2) |Q − R| = 90.
- by Max@Math Revolution
Mon Jul 19, 2021 1:20 am- Forum: Data Sufficiency
- Topic: Que: If P, Q, & R are numbers on the number line, not necessarily in that order, is ....
- Replies: 1
- Views: 217
Que: An instructor gave the same test to three groups: A, B, and C. The average (arithmetic mean).......
Problem Solving
Re: Que: An instructor gave the same test to three groups: A, B, and C. The average (arithmetic mean).......
Solution: Let the number of candidates in groups A, B, and C be 1k, 3k, and 5k, respectively, where ‘k's is a constant of proportionality. The average (arithmetic mean) scores for the three groups were 40, 50, and 60, respectively. The combined average for the three groups is => \(\frac{\left(40\cd...
- by Max@Math Revolution
Mon Jul 19, 2021 1:16 am- Forum: Problem Solving
- Topic: Que: An instructor gave the same test to three groups: A, B, and C. The average (arithmetic mean).......
- Replies: 1
- Views: 223
Re: Que: What is the value of x?
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 1:12 am- Forum: Data Sufficiency
- Topic: Que: What is the value of x?
- Replies: 1
- Views: 250
Que: An instructor gave the same test to three groups: A, B, and C. The average (arithmetic mean).......
Problem Solving
Que: An instructor gave the same test to three groups: A, B, and C. The average (arithmetic mean).......
Que: An instructor gave the same test to three groups: A, B, and C. The average (arithmetic mean) scores for the three groups were 40, 50, and 60, respectively. The ratio of the numbers of candidates in the A, B, and C groups were 1 : 3: 5, respectively. What was the average score for the three gro...
- by Max@Math Revolution
Sat Jul 17, 2021 9:24 pm- Forum: Problem Solving
- Topic: Que: An instructor gave the same test to three groups: A, B, and C. The average (arithmetic mean).......
- Replies: 1
- Views: 223
Que: What is the value of x?
Que: What is the value of x?
1. \(3\left(x+y\right)=x+3y\).
2. \(x^2+y^2=\left(x+y\right)^2\).
- by Max@Math Revolution
Sat Jul 17, 2021 9:22 pm- Forum: Data Sufficiency
- Topic: Que: What is the value of x?
- Replies: 1
- Views: 250
Que: The trader first decreased the selling price of a car by 30 percent and then increased by 30 percent.....
Problem Solving
Re: Que: The trader first decreased the selling price of a car by 30 percent and then increased by 30 percent.....
Solution: Let us apply the IVY approach to solve the question. As we are dealing with percentage, then let the original price of a car be $100. Price after price reduced by 30%: (100 - 30)% of $100 => \(\frac{70}{100}\cdot$100=$70\) Price after the new price increased by 30%: (100 + 30)% of $70 => ...
- by Max@Math Revolution
Sat Jul 17, 2021 9:19 pm- Forum: Problem Solving
- Topic: Que: The trader first decreased the selling price of a car by 30 percent and then increased by 30 percent.....
- Replies: 1
- Views: 215
Re: Que: Is xy < 15?
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 Jul 17, 2021 9:09 pm- Forum: Data Sufficiency
- Topic: Que: Is xy < 15?
- Replies: 1
- Views: 215
Que: The trader first decreased the selling price of a car by 30 percent and then increased by 30 percent.....
Problem Solving
Que: The trader first decreased the selling price of a car by 30 percent and then increased by 30 percent.....
Que: The trader first decreased the selling price of a car by 30 percent and then increased by 30 percent. Which of the following represents the final percent change in the selling price of the bicycle?
(A) 9% less
(B) 0%
(C) 9% more
(D) 91% less
(E) 91% more
- by Max@Math Revolution
Fri Jul 16, 2021 8:59 am- Forum: Problem Solving
- Topic: Que: The trader first decreased the selling price of a car by 30 percent and then increased by 30 percent.....
- Replies: 1
- Views: 215
- by Max@Math Revolution
Fri Jul 16, 2021 8:55 am- Forum: Data Sufficiency
- Topic: Que: Is xy < 15?
- Replies: 1
- Views: 215
Que: A juice manufacturer has 1,800 liters of mango pulp in stock, 30 percent of which is water.....
Problem Solving
Re: Que: A juice manufacturer has 1,800 liters of mango pulp in stock, 30 percent of which is water.....
Solution: The resultant percentage will be the weighted average of the percentages of the above two stocks. => \(\frac{\left(1800\ \cdot\ 0.3\right)+\left(600\ \cdot\ 0.3\right)}{1800+600}\cdot100\) => \(\frac{\left(540\right)+\left(180\right)}{2400}\cdot100\) => \(\frac{720}{2400}\cdot100\) => 30% ...
- by Max@Math Revolution
Fri Jul 16, 2021 8:50 am- Forum: Problem Solving
- Topic: Que: A juice manufacturer has 1,800 liters of mango pulp in stock, 30 percent of which is water.....
- Replies: 1
- Views: 260
Re: Que: If x and y are positive integers, is xy a multiple of 12?
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
Fri Jul 16, 2021 8:36 am- Forum: Data Sufficiency
- Topic: Que: If x and y are positive integers, is xy a multiple of 12?
- Replies: 1
- Views: 210
Que: A juice manufacturer has 1,800 liters of mango pulp in stock, 30 percent of which is water.....
Problem Solving
Que: A juice manufacturer has 1,800 liters of mango pulp in stock, 30 percent of which is water.....
Que: A juice manufacturer has 1,800 liters of mango pulp in stock, 30 percent of which is water. If the manufacturer adds another 600 liters of mango pulp of which 30 percent is water, what percent, by volume, of the manufacturer’s mango pulp contains water? (A) 20% (B) 25% (C) 30% (D) 35% (E) 40%
- by Max@Math Revolution
Wed Jul 14, 2021 8:30 pm- Forum: Problem Solving
- Topic: Que: A juice manufacturer has 1,800 liters of mango pulp in stock, 30 percent of which is water.....
- Replies: 1
- Views: 260
Que: If x and y are positive integers, is xy a multiple of 12?
Que: If x and y are positive integers, is xy a multiple of 12?
(1) x is a multiple of 3.
(2) y is a multiple of x.
- by Max@Math Revolution
Wed Jul 14, 2021 8:29 pm- Forum: Data Sufficiency
- Topic: Que: If x and y are positive integers, is xy a multiple of 12?
- Replies: 1
- Views: 210
Que: Item X attracts a sales tax rate of $1.00 per $30. What is the sales tax rate, as a percent.......
Problem Solving
Re: Que: Item X attracts a sales tax rate of $1.00 per $30. What is the sales tax rate, as a percent.......
Solution: Tax paid on $30 = $1.00 Thus, a tax, which is three times as much as the above, would be $(1.00 × 3) = $3.00 on $30. Thus, the tax rate = \(\frac{3.00}{30}=0.1\) Thus, this tax, expressed as a percentage = \(0.1=1\cdot\frac{1}{10}=10\%\) Therefore, D is the correct answer. Answer D
- by Max@Math Revolution
Wed Jul 14, 2021 8:26 pm- Forum: Problem Solving
- Topic: Que: Item X attracts a sales tax rate of $1.00 per $30. What is the sales tax rate, as a percent.......
- Replies: 1
- Views: 180