Syntel Company Numerical Ability Profit and Loss

a man gets a gain of x%. but if he had sold at twice the cost price, what will be his gain?

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Syntel Other Question

a string of pearls such that 1/3 is lost and of that 1/4th is missing, remaining is 20 then actual number of pearls?
ans. 40
a clock was 7minutes behind the actual time on 3 p.m. on Wednesday and 8 minutes ahead of actual time on (not sure) 4 p.m. Friday. when will it show the correct time?