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gmatprep - friends rate

by Gurpinder » Mon Sep 20, 2010 2:46 pm
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I see that (1) is insufficient.

But how is (2) sufficient?

It suggests that the cost now is $15 more to each since there are only 3 people.
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by mgm » Mon Sep 20, 2010 7:50 pm
Let A,B,C be the cost per person => A+B+C = T <Total Cost>

Now after adding the fourth person the Cost per person is reduced by $15
=> A-15 + B-15 + C-15 + D = T
=> A+B+C + D = T+45
=> T + D = T + 45
=> D = 45

Hence A = B = C = D = 45
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by neerajkumar1_1 » Mon Sep 20, 2010 8:47 pm
statement 1 gives a relation bet 2 week cost to 1 week cost... so insufficient

statement 2 gives total/4= total/3 - 15

so u can get the total from this eqn... sufficient...

hence IMO B
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