In a classroom, the ratio of the number of students who like maths to the number of students who like science is 2:5. If the number of students who like science is 20, then find the total number of students.

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Solution

The correct option is D 28
Given, the ratio of the number of students who like maths to the number of students who like science = 2 : 5.

The number of students who like science is 20. We know that,
$5 \times 4 = 20$

When we multiply 4 with 5, we get 20.
Hence, the multiplier is 4.

So, the number of students who like maths will be
$2 \times 4 = 8$
The number of students who like maths = 8.
The total number of students = 8 + 20 = 28.

Items in the Ratio Numbers in the Ratio Actual Value Multiplier

Students who like Maths 2 8 4

Students who like Science 5 20 4

Total 7 28

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Items in the Ratio	Numbers in the Ratio	Actual Value	Multiplier
Students who like Maths	2	8	4
Students who like Science	5	20	4
Total	7	28