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Thirty boys and X girls sat for a test. The mean of the boys' scores and that of ...


Question

Thirty boys and X girls sat for a test. The mean of the boys' scores and that of the girls were respectively 6 and 8. Find 8 if the total score was 468.

Options

A) 38

B) 24

C) 36

D) 22

E) 41

The correct answer is C.

Explanation:

Le the number of girls = A; Total score of boys = 30 \(\times\) 6 = 180
Total score of girls = A \(\times\) 8 = 8A
\(\therefore\) 180 + 8A = 468
8A = 288
A = 36

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Dicussion (1)

  • Le the number of girls = A; Total score of boys = 30 \(\times\) 6 = 180
    Total score of girls = A \(\times\) 8 = 8A
    \(\therefore\) 180 + 8A = 468
    8A = 288
    A = 36

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