In a class, the number of boys and girls are in the ratio of 3 : 5. What is the percentage of boys in the class?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is Option 4 i.e. 37.5%.
Let the total number of students in the class be 100.
The numbers of boys and girls are in the ratio of 3 : 5
Let the common ratio be x.
According to the question -
⇒ 3x + 5x = 100
⇒ 8x = 100
⇒ x = 12.5
Number of boys in a class = 3x = 3 × 12.5 = 37.5
Percentage of boys in the class = [Number of boys/Total students] × 100
= [37.5/100] × 100 = 37.5%