instruction:
The task is to generate the correct answer for a given math problem.
question:
Problem: how many zeroes are there at the end of the number n , if n = 70 ! + 140 ! ?
answer:
16

question:
Problem: a train 300 m long is running with a speed of 68 kmph . in what time will it pass a man who is running at 8 kmph in the same direction in which the train is going ?
answer:
18 sec .

question:
Problem: if f ( x ) = 12 - x ^ 2 / 2 and f ( 2 k ) = 4 k , what is one possible value for k ?
answer:
4