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

[Q]: Problem: in a garment industry , 12 men working 9 hours per day complete a piece of work in 10 days . to complete the same work in 12 days , working 15 hours a day , the number of men required is :
[A]: 7


[Q]: Problem: the number of boxes in a warehouse can be divided evenly into 7 equal shipments by boat or 28 equal shipments by truck . what is the smallest number of boxes that could be in the warehouse ?
[A]: 28


[Q]: Problem: if 4 x + y = 8 and 3 x - 4 y = 5 , then what is the value of 7 x - 3 y ?
[A]:
23