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

[Q]: Problem: at what rate percent on simple interest will rs . 750 amount to rs . 900 in 8 years ?
[A]: 2.5 %


[Q]: Problem: a reduction of 20 % in the price of oil enables a house wife to obtain 4 kgs more for rs . 600 , what is the reduced price for kg ?
[A]: 30


[Q]: Problem: if 5 + 7 / x = 6 - 5 / x , then x =
[A]:
12