TASK DEFINITION: The task is to generate the correct answer for a given math problem.
PROBLEM: Problem: what is the value of x ^ 2 yz − xyz ^ 2 , if x = − 2 , y = 1 , and z = 1 ?

SOLUTION: 6

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

PROBLEM: Problem: john left home and drove at the rate of 45 mph for 2 hours . he stopped for lunch then drove for another 3 hours at the rate of 45 mph to reach his destination . how many miles did john drive ?

SOLUTION:
225 miles .