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.

[Q]: If Lawrence walked 4 kilometers at 3 kilometers per hour , how long was Lawrence walking ?
[A]: 1

[Q]: Professor Ellison weighed 2 pieces of metal for an experiment . The piece of iron weighed 11.166666666666666 pounds and the piece of aluminum weighed 0.8333333333333334 pound . How much more did the piece of iron weigh than the piece of aluminum ?
[A]: 10.333333333333334

[Q]: While shopping for music online , Isabel bought 4 country albums and 5 pop albums . Each album came with a lyric sheet and had 8 songs . How many songs did Isabel buy total ?
[A]:
72