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ASHA 777 [7]
3 years ago
12

The average of 8 scores is Q. If the average of 3 of the scores is Z, what is the average of the other 5 scores?

Mathematics
1 answer:
OLga [1]3 years ago
7 0
\dfrac{s_1+\cdots+s_8}{8}=Q\implies s_1+\cdots+s_8=8Q
\dfrac{s_1+s_2+s_3}{3}=Z\implies s_1+s_2+s_3=3Z

Substituting into the first equation, this means

s_4+\cdots+s_8=8Q-3Z

Divide by 5 to get the average:

\dfrac{s_4+\cdots+s_8}{5}=\dfrac{8Q-3Z}5
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Cost of the spa treatment = $42
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Normally the tips amount is calculated before adding sales tax.
Then
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