amitansu wrote:Who shared the maximum profit among A, B and C ?

1. The ratio of their investment is 1:2:3

2. The ratio of the times for which they invested was inversely proportional to the ratios of their investments.

wait what?
is this all the information they gave you?
if so, then it's definitely insufficient, because you have to know how the investments work in the first place.

for instance, if the investment is based on simple interest, then each of them would make exactly the same profit, since they're investing for times in the ratio 1 : 1/2 : 1/3.

if the investment is based on compound interest, or on some other protocol, then they could indeed have differential profits.

in any case, what else does the problem tell you? and if it doesn't tell you anything else, where'd you get this awful thing?

amitansu wrote:I have couple of ds problem sources irrespective of GMAT style !!

well, ok.
hopefully, though, you've already gone through as many questions as possible from sources that do have the same style as the gmat: official problems first, then big-name prep books, then everything else.

if you've already exhausted all the major sources, though, then i guess additional sources couldn't hurt.

good luck!