SOLUTION: 4/5 of the pupils who took the exam passed. 18 pupils failed. how many pupils passed?

Question 987726: 4/5 of the pupils who took the exam passed. 18 pupils failed. how many pupils passed?

Answer by Edwin McCravy(20060) (Show Source): You can put this solution on YOUR website!

 of the pupils who took the exam passed. 

So  failed

18 pupils failed. 

So if there are N pupils, then since 1/5 failed,

N = 18

Multiply both sides by 5

N = 90

how many pupils passed?

90 - 18 = 72.

Edwin

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