You are given a math word problem and you are supposed to apply multiple mathematical operators like addition, subtraction, multiplication or division on the numbers embedded in the text to answer the following question and then only report the final numerical answer.

In fourth grade there were 4 students at the start of the year . During the year 3 students left and 42 new students came to school . How many students were in fourth grade at the end ?
43

In fourth grade there were 40 students at the start of the year . During the year 14 students left and 26 new students came to school . How many students were in fourth grade at the end ?
52

Last Saturday , Spencer walked all over town running errands . First , he walked 0.3 mile from his house to the library and 0.1 mile from the library to the post office . Then he walked 0.4 mile from the post office back home . How many miles did Spencer walk in all ?

0.8