TASK DEFINITION: You are given a math word problem and you are supposed to apply addition or subtraction mathematical operators on the numbers embedded in the text to answer the following question and then only report the final numerical answer.
PROBLEM: There are 40 boys and some girls on the playground . There are 117 children altogether . How many girls are on the playground ?

SOLUTION: 77

PROBLEM: Fred has 5 yellow balloons , Sam has 6 yellow balloons , and Mary has 7 yellow balloons . The balloons cost 5 dollars . How many yellow balloons do they have in total ?

SOLUTION: 18

PROBLEM: The tallest player on the basketball team is 77.75 inches tall . This is 9.5 inches taller than the shortest player . How tall is the shortest player , in inches ?

SOLUTION:
68.25