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spent on cosmetics and friends

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spent on cosmetics and friends

by sanju09 » Sat May 10, 2014 12:21 am
Cindy spent 20 percent of her pocket money on cosmetics; she distributed 40 percent of her remaining pocket money equally among her four friends. She then keeps all her remaining pocket money in to her empty piggy bank. If the money in her piggy bank now is $6 less than what she spent on cosmetics and friends, how many dollars does each of her friend receive from Cindy?
A. 12
B. 18
C. 24
D. 36
E. 48


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by theCodeToGMAT » Sat May 10, 2014 9:24 am
Cosmetic = 20%
Remaining = 80%
To frnds = 40% of 80% of x
Remaining = 60% of 80% of x = Piggy Bank

60% of 80% of x = 20% of x + 40% of 80% of x - 6
.48x = .2x + .32x - 6
.04x = 6
x = 600/4 = 150

To frnd = .32/4 * 150 =. 0.08 * 150 = 12

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by sanju09 » Sun May 11, 2014 12:05 am
Repeat post deleted!
Last edited by sanju09 on Sun May 11, 2014 12:07 am, edited 1 time in total.
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by sanju09 » Sun May 11, 2014 12:06 am
Algebra complicates the way out of these kinds of questions; moreover the risk of inane errors is potential too. Percent questions on GMAT are best cracked taking 100 as the base total, because they choose numbers for this little reason only, so that if the right way is adopted, calculations would go real smooth.

If her pocket money is 100, then she must have spent 20 on cosmetics and 40 percent of 80 that's 32 on her four friends such that each of her friend receives 8 (we are to answer what this 8 is equivalent to) from her. In this manner, she spent a total of 20 + 32 = 52 on cosmetics and friends, and saved 100 - 52 = 48 to the piggy bank such that SPENT - SAVED = 52 - 48 = 4 (in question it's given to be $6). Now let's ask if 4 is equivalent 6, then 8 is equivalent to...
The mind is everything. What you think you become. -Lord Buddha



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Quantitative Instructor
The Princeton Review - Manya Abroad
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