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

Q: Problem: if x and j are integers and 2 x – j = 11 , then 4 x + j can not be

A: 17
****
Q: Problem: a can do a piece of work in 22 days and b alone can do it in 10 days . b works at it for 5 days and then leaves . a alone can finish the remaining work in

A: 11 days
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Q: Problem: roses can be purchased individually for $ 6.30 , one dozen for $ 36 , or two dozen for $ 50 . what is the greatest number of roses that can be purchased for $ 680 ?

A:
316
****