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docker41 [41]
3 years ago
13

On his first two social studies tests, Billy made an 86 and a 93. What grade must Billy make on the third test to have an averag

e of 90 for all three tests?
Mathematics
2 answers:
Softa [21]3 years ago
8 0
An average is calculated by
(T1 + T2 + T3)
-------------------
          3
so we have
86 + 93 + x
---------------- = 90
         3
then you just solve for x.

86 + 93 + x = 270
270 - 86 - 93 = x

Billy must score a 91.
timurjin [86]3 years ago
3 0
90 * 3 = 270

86 + 93 = 179

270 -179 = 91

answer: He needs to make 91 <span>on the third test to have an average of 90 for all three tests</span>
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