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.

[Q]: You have 7 balloons and your friend has 5 balloons . How many more balloons do you have than your friend ?
[A]: 2


[Q]: There were 28 girls and 35 boys on the playground at recess . How many children were there in all ?
[A]: 63


[Q]: If each ball costs $ 1.54 , how much must Kyoko pay for 3 balls ?
[A]:
4.62