GRE Exam Numerical Ability Time and Work

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

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GRE Other Question

10 liter of water were added to 10 liter of a 30% strong sol of sulphuric acid, then strenthg of resulting sol is? 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....