SOLUTION: During the last five races, jim's race car used an average of 15 gallons of gas per race. If his race car used a total of 51 gallons of gas during the first three races, what was

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Question 174024: During the last five races, jim's race car used an average of 15 gallons of gas per race. If his race car used a total of 51 gallons of gas during the first three races, what was the total number of gallons of gas used during the last two races?
Answer by Mathtut(3670) About Me  (Show Source):
You can put this solution on YOUR website!
let z be the gas used in the last two races
:
51+z/5=15........
:
51+z=75
:
z=75-51
:
highlight%28z=24%29gallons used in the last 2 races.
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