Discussion

Explanation:

Let the total number of students be 100x.

So, number of girls and boys are 60x and 40x respectively.

There are 30 more girls than boys ∴ 60x = 40x + 30. 

∴ x = 3/2.

Number of students who passed = 68x = 68 × (3/2) = 102 out of which 30 boys passed.  

So, number of girls who passed = 102 − 30 = 72  

Number of girls who did not pass = 60x − 72 = 90 − 72 = 18. 

Required percentage = [18/90] × 100 = 20%.

Hence, 20.

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