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

Input: Consider Input: Problem: if 4 xz + yw = 10 and xw + yz = 20 , what is the value of the expression ( 2 x + y ) ( 2 z + w ) ?

Output: 50 .


Input: Consider Input: Problem: what is the probability of getting a queen or spade from a set of cards ?

Output: 4 / 13


Input: Consider Input: Problem: cheese , bologna , and peanut butter sandwiches were made for a picnic in a ratio of 1 to 7 to 8 . if a total of 80 sandwiches were made , how many bologna sandwiches were made ?


Output: 35