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

[Q]: Problem: working together , wayne and his son can shovel the entire driveway in three hours . if wayne can shovel six times as fast as his son can , how many hours would it take for his son to shovel the entire driveway on his own ?
[A]: 7


[Q]: Problem: two numbers are in the ratio 3 : 5 . if 9 be subtracted from each , they are in the ratio of 1 : 2 . the first number is :
[A]: a ) 27


[Q]: Problem: 90 + 5 * 12 / ( 180 / 3 ) = ?
[A]:
91