The task is to generate the correct answer for a given math problem.

Q: Problem: a cycle is bought for rs . 900 and sold for rs . 1170 , find the gain percent ?

A: 30 %
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Q: Problem: a is twice as good a workman as b and they took 6 days together to do the work b alone can do it in .

A: 18 days
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Q: Problem: in what ratio must water be mixed with milk to gain 16 2 / 3 % on selling the mixture at cost price ?

A:
1 : 6
****