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In a class of 72 pupils, the ratio of passes to failures in the final exam was 8:1. How many pupils passed the exam?

P.S please show working out.

Respuesta :

TooNashty
72 total pupils
8x passed the test, x did not 
8x + x = 72
9x = 72
x = 8

So since 8x passed the test, substitute 8 for x
8(8) = 64

64 pupils passed the exam

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