In a certain school, 20% of students are below 8 years of age. The number of students above 8 years of age is of the number of students of 8 years of age which is 48. What is the total number of students in the school?
- 70
- 100
- 150
- 200
Explanation
100
The number of students is x. So
Number of students over 8 years old
= (100-20)% of x = 80% of x
∴ 80% of x = 48 + 23 of48
⇒ 80 100x = 80
⇒ x = 100
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