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John has grades of 83 and 91 on his first two history tests. What must he score on his third test so that his average is at least 88?

John has grades of 83 and 91 on his first two history tests. What must he score on his third test so that his average is at least 88?
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1 vote
John has grades of 83 and 91 on his first two history tests. What must he score on his third test so that his

average is at least 88?

User Dhamibirendra
by
8.3k points

1 Answer

5 votes

Answer:

90

Explanation:

(let x be his 3rd test grade)


88=(83+91+x)/(3) \\264=83+91+x\\264=174+x\\x=90

User Duli
by
8.8k points
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