TASK DEFINITION: You are given a math word problem and you are supposed to apply a single mathematical operators like addition, subtraction, multiplication or division on the numbers embedded in the text to answer the following question and then only report final the numerical answer.
PROBLEM: Cade had 87 marbles . He gave 8 to Dylan . How many does he have left ?

SOLUTION: 79

PROBLEM: There are 7.75 gallons of water in Becky 's fish tank . If Becky adds 7 gallons more , how many gallons will there be in all ?

SOLUTION: 14.75

PROBLEM: There are 7 crayons in the drawer . Mary took 3 crayons out of the drawer . How many crayons are there now ?

SOLUTION:
4