You are provided with an arithmetic question. Your task is to compute the solution using the given arithmetic operations. The only arithmetic operators needed to answer the questions are'+'(addition) and'-'(subtraction). The answer should be correct to one decimal place.

When Jake had 1 cat, he needed to serve 0.5 can of cat food each day. Now that Jake has adopted a second cat, he needs to serve a totalof 0.9 can each day. How much extra food is needed to feed thesecond cat?
0.4

Keith spent $136.06 on speakers, $139.38 on a CD player, and $112.46 on new tires. He wanted 3 CD's for $6.16, but did n't buythem. In total, how much did he spend?
387.9

Sally had 760 quarters in her bank. She spent 418 of her quarters.How many quarters does she have now?

342.0

