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.

John walks 0.7 miles to school and Nina walks 0.4 miles to school . How much farther does John walk than Nina ?
0.3

A waiter had 9 tables he was waiting on , with 2 women and 6 men at each table . How many customers total did the waiter have ?
72

For Halloween Emily received 5 pieces of candy from neighbors and 13 pieces from her older sister . If she only ate 9 pieces a day , how long would the candy last her ?
2