instruction:
The task is to generate the correct answer for a given math problem.
question:
Problem: find the cost of fencing around a circular field of diameter 16 m at the rate of rs . 3 a meter ?
answer:
150.84

question:
Problem: if 4 xz + yw = 10 and xw + yz = 20 , what is the value of the expression ( 2 x + y ) ( 2 z + w ) ?
answer:
50 .

question:
Problem: how many factors does 36 ^ 2 have ?
answer:
25