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jacqui has grades of 87 and 83 on her first two algebra tests. if she wants an average of at least 74, what possible scores can she make on her third test?
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May 1, 2019
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jacqui has grades of 87 and 83 on her first two algebra tests. if she wants an average of at least 74, what possible scores can she make on her third test?
Mathematics
middle-school
Doug Henderson
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Find this:
87 + 83 + x
----------------- = 74
3
Mult. both sides by 4: 87+83+x = 222, and 170 + x = 222
Then x = 222-170 = 52.
With a score of 52 or better on her 3rd test, J. would have an average of 74 or better.
Mohd Farid
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May 2, 2019
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(80+82+x)/ 3>=74
(80+82+x)=3x74
162+x>=222
x>=60
she has to have 60 or above.
Xhallix
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May 6, 2019
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