Search found 23 matches
If 9 can assemble 10 in (20*7.5=) 150 hours, 1 can assemble 10 in (150*9=) 1350 hours. In the new case, 2 people can work as much as 3 before. So 12 new workers = 18 old workers. 18 old workers could assemble 10 in 75 hrs and 20 in 150 hrs. Working 6 hours a day, it would take the new workers 150/6 ...
- by testprepDublin
Wed Jul 13, 2011 4:54 am- Forum: Problem Solving
- Topic: TV assemble
- Replies: 3
- Views: 1938
The distance between each intersection point and the centre of the circle is the radius of the circle. Since the two intersection points must be at equal length from the y-axis, the intersection points are (-8, 0) and (8,0). The distance between one of these points and the centre is = √(8^2+6^2)=â...
- by testprepDublin
Mon Jul 11, 2011 8:51 am- Forum: Problem Solving
- Topic: Help please!
- Replies: 3
- Views: 1018
Yes these types of questions are part of GMAT quant. The best way to solve these is to draw boxes with the quantities of each mixture to illustrate the problem. For example, if 100ml of drink A containing 5% alcohol is mixed with 200ml of drink B containing 10% alcohol and you want to find the final...
- by testprepDublin
Mon Jul 11, 2011 8:35 am- Forum: Problem Solving
- Topic: Are Alligation and Mixture problems part of GMAT Quant ?
- Replies: 1
- Views: 1261
There is nothing wrong with your method but there is a simpler way to do it.
Since we know x/y=96.12 and we know the remainder is 9, we can find the denominator (y) by dividing 9 by 0.12 which gives 75. The answer is B.
- by testprepDublin
Mon Jul 11, 2011 6:31 am- Forum: Problem Solving
- Topic: divisibility
- Replies: 2
- Views: 966
"Had been" indicates the guns were sold before they were confiscated by the police while "have been" indicates that the guns were sold after they were confiscated by the police. "Have been" would only make sense here if the police were the ones that sold them after they...
- by testprepDublin
Mon Jul 11, 2011 6:17 am- Forum: Sentence Correction
- Topic: Tense Ambiguity
- Replies: 3
- Views: 1752
The only way you can improve on your score is through practice. You must identify your weaknesses and turn them into strengths. Use any free resource you can find and do all the free online GMAT practice tests. Take note of the sections you are weakest in and what you are doing wrong in them. There ...
- by testprepDublin
Mon Jul 11, 2011 6:08 am- Forum: GMAT Strategy
- Topic: Need Help - GMAT score - 630 (Q-42, V-34)
- Replies: 3
- Views: 1836
Taking the information given, we have: Smith A : C : P 1 : 4 : 8 Windsor A : C 1 : 5 Cs + Cw = 45 Since Cs has to be a multiple of 4 and Cw has to be a multiple of 5, the only options here are Cs=20, Cw=25 and Cs=40, Cw=5. If Cs=20, As has to be 5 (As:Cs=1:4). If Cs is 40, As has to be 10. Looking a...
- by testprepDublin
Wed Jul 06, 2011 8:27 am- Forum: Problem Solving
- Topic: Kaplan Horse PS Problem
- Replies: 7
- Views: 1890
x:y = 7:3. We write this as a fraction: x/y = 7/3 => 3x = 7y.
We also have (x-z)/(y+z) = 7/8 => 8x - 8z = 7y +7z => 8x = 7y + 15z.
Taking away the first equation from the second, we get: 5x = 15z => z = x/3.
- by testprepDublin
Wed Jul 06, 2011 7:24 am- Forum: Problem Solving
- Topic: Fractions.
- Replies: 1
- Views: 1348
If the square of n < 1/100 and n < 0, then -1/10 < n < 0. (square root of 1/100 is +/-1/10)
Since a reciprocal multiplies a number into 1, the reciprocal < 1/(-1/10) => < -10.
The answer is A.
- by testprepDublin
Tue Jul 05, 2011 6:27 am- Forum: Problem Solving
- Topic: Number Line Word Problem
- Replies: 6
- Views: 2355
Standard deviation is lowest when data points are close to the mean. Therefore when adding new data, the closer the new data is to the previous mean the lower the new standard deviation will be. The answer is E. This is because by adding new data identical to the mean, the overall 102 data list beco...
- by testprepDublin
Tue Jul 05, 2011 6:15 am- Forum: Problem Solving
- Topic: Standard Deviation
- Replies: 2
- Views: 1023
This isn't a data sufficiency question. In data sufficiency questions, you need to know the formulae for simple and compound interest: Simple Interest: I = a + Ti Compound Interest: A = a(1 + r/n)^(nT) A = Accumulated investment a = initial investment T = no. of investment periods i = simple interes...
- by testprepDublin
Mon Jul 04, 2011 7:55 am- Forum: Data Sufficiency
- Topic: compound intrest
- Replies: 1
- Views: 1147
Information we were given: Lowest in May: $4,500. Range in May: $15,000. Lowest in June: $6,100. Range in June: $16,500. We want to find the highest in each month: Highest in May = $4,500+$15,000=$19,500. Highest in June = $6,100+$16,500=$22,600. Now, using the highest and lowest prices over the two...
- by testprepDublin
Mon Jul 04, 2011 7:45 am- Forum: Problem Solving
- Topic: Range
- Replies: 2
- Views: 1076
There are 3!(=6) equally likely ways he can pick all three colors in 3 picks.
P(rbg) = 2/9*3/8*4/7 = 1/21.
3!*1/21=2/7
- by testprepDublin
Fri Jul 01, 2011 8:44 am- Forum: Problem Solving
- Topic: Probability
- Replies: 2
- Views: 1056
If (-a , b) and (-b , a) are in the same quadrant and if a a & b are non-zero then a and b must have the same sign . As -a is in the same quadrant as -b and a is in the same quadrant as b. So if (-x,y) is to be same quadrant x and y must have the same sign as each other and as a and b. (1) same ...
- by testprepDublin
Fri Jul 01, 2011 6:22 am- Forum: Data Sufficiency
- Topic: Quadrant
- Replies: 3
- Views: 1012
Hi Aman,
I agree with you. From (2) we see c, d & e all have the same sign but you're right it could be positive or negative.
Where did you get the question from? I find there can sometimes be small errors like this in non-official questions.
Deirdre
- by testprepDublin
Fri Jul 01, 2011 5:58 am- Forum: Data Sufficiency
- Topic: Number Properties : Data Sufficiency - GROCKIT
- Replies: 3
- Views: 980