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pradeepkaushal9518
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how to arrive at the answer:
Statement I: hmm... will have an equation with n^2 ... i may end up with positive and negative... but since only positive values will make sense, this will be sufficient
Statement II: ok, i have total amount... so using 'n' and the total amount, i can set set up an equation here too...end up with a quadratic (just as i did in Statement I) .. only positive values are acceptable... so this is also sufficient by itself
--> Choice D
If you are interested, here are the solutions for each statement (please don't solve DS questions)
I
500n = 1/16 (500n + 500n^2)
16 x 500n = 500n (1+n)
16 = 1+n
n = 15
II
500n + 500n^2 = 120000
500n (1+n) = 120,000
n (n+1) = 240
n = 15
Another interesting obsrevation, which many students don't realize is that both statements give the same answer... this will always be the case for DS questions where the correct answer is D
