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

[Q]: 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
[A]: 21


[Q]: Problem: the area of a triangle is with base 10 m and height 5 m ?
[A]: 25


[Q]: Problem: a train 560 m long , running with a speed of 63 km / hr will pass a tree in ?
[A]:
3