TASK DEFINITION: The task is to generate the correct answer for a given math problem.
PROBLEM: Problem: a student chose a number , multiplied it by 2 , then subtracted 138 from the result and got 102 . what was the number he chose ?

SOLUTION: 120

PROBLEM: Problem: by investing in 1623 % stock at 64 , one earns rs . 1500 . the investment made is

SOLUTION: rs . 5760

PROBLEM: Problem: a square mirror has exactly half the area of the rectangular wall on which it is hung . if each side of the mirror is 54 inches and the width of the wall is 68 inches , what is the length of the wall , in inches ?

SOLUTION:
85.7', 'e ) 56.7'