TASK DEFINITION: The task is to generate the correct answer for a given math problem.
PROBLEM: Problem: if 4 xz + yw = 10 and xw + yz = 20 , what is the value of the expression ( 2 x + y ) ( 2 z + w ) ?

SOLUTION: 50 .

PROBLEM: Problem: a starts business with rs . 3500 and after 8 months , b joins with a as his partner . after a year , the profit is divided in the ratio 2 : 3 . what is b â € ™ s contribution in the capital ?

SOLUTION: 15750

PROBLEM: Problem: the ages of two person differ by 12 years . if 5 years ago , the elder one be 5 times as old as the younger one , their present ages ( in years ) are respectively

SOLUTION:
20