in an exam 90% students pass if 15 student failed, find the number of students appared in the examination
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total student = 100%
90% pass
10% fail
10% = 15
100% = X
X = (15 × 100)÷10
= 150 student
90% pass
10% fail
10% = 15
100% = X
X = (15 × 100)÷10
= 150 student
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