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

[Q]: Problem: when positive integer n is divided by positive integer p , the quotient is 18 , with a remainder of 7 . when n is divided by ( p + 3 ) , the quotient is 15 and the remainder is 1 . what is the value of n ?
[A]: 20

[Q]: Problem: what is the units digit of 26 ! + 50 ! + 4 ! + 4 ! ?
[A]: 8

[Q]: Problem: together , 15 type a machines and 7 type b machines can complete a certain job in 4 hours . together 8 type b machines and 15 type c machines can complete the same job in 11 hours . how many q hours would it take one type a machine , one type b machine , and one type c machine working together to complete the job ( assuming constant rates for each machine ) ?
[A]:
44 hours