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: sandy gets 3 marks for each correct sum and loses 2 marks for each incorrect sum . sandy attempts 30 sums and obtains 50 marks . how many sums did sandy get correct ?

SOLUTION: 22

PROBLEM: Problem: the population of a city is 415600 . it increased by 25 % in the first year and decreased by 30 % in the second year . what is the population of the city at the end of second year ?

SOLUTION:
363650