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

Ex Input:
Problem: when positive integer n is divided by positive integer p , the quotient is 18 , with a remainder of 7 . when n is divided by ( p + 3 ) , the quotient is 15 and the remainder is 1 . what is the value of n ?

Ex Output:
20


Ex Input:
Problem: a rectangle having length 89 cm and width 34 cm . if the length of the rectangle is increased by eighty percent then how much percent the breadth should be decreased so as to maintain the same area .

Ex Output:
47.33 %


Ex Input:
Problem: the present worth of $ 169 due in 2 years at 4 % per annum compound interest is ?

Ex Output:

$ 156.25