GRE Exam Numerical Ability Profit and Loss

A man purchases 2 watches for Rs. 560.
He sells one at 15% profit and the other at
10% loss. He neither gains nor loses. Thus,
the cost prices of 2 watches are....

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GRE Other Question

a small factory with 3 machines has a job of stamping out a number of pan covers, the newest machine can do it in 3 days, and the other machine can do it in 4days and the 3rd machine can do it in 6 days how many days will the factory take to do the job using the three machines A dishonest seller uses a weight of 800 gram in place of 1 kg and adds 20% impurities in sugar. What would be his profit percentage it he claims to be selling at the cost price?