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

Problem: if x , y , and z are positive integers , and 3 x = 5 y = 6 z , then the least possible value of x + y + z is
21

Problem: what is the total number of integers between 10 and 50 that are divisible by 2 ?
19

Problem: for each color copy , print shop x charges $ 1.25 and print shop y charges $ 2.75 . how much greater is the charge for 40 color copies at print shop y than at print shop x ?

$ 60