instruction:
The task is to generate the correct answer for a given math problem.
question:
Problem: excluding stoppages , the speed of the bus is 54 kmph and including stoppages , it is 36 kmph . for how many minutes does the bus stop per hr
answer:
20 mi


question:
Problem: three 7 faced dice are thrown together . the probability that all the three show the same number on them is ?
answer:
1 / 49


question:
Problem: if x , y , and z are positive real numbers such that x + y - z = 50 , y - z + x = 60 , and z - x + y = 80 , then find the z value ?
answer:

5