instruction:
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.
question:
A restaurant made 9 hamburgers and 4 hot dogs to serve during lunch. Only 3 hamburgers were actually served. How many hamburgerswere over?
answer:
6.0

question:
0.5 the students in the band are in the trumpet section. 0.3 thestudents in the band are in the trombone section. What fraction ofthe students in the band are in either the trumpet section or thetrombone section?
answer:
0.8

question:
At the hardware store, 0.2 the nails are size 2d and 0.5 the nails are size 4d. What fraction of the nails are either size 2d or 4d?
answer:
0.7