In an examination out of 560 students, 80% of the girls and 70% of the boys passed. If total percentage of passed students was 75%, then which one of the following is not correct?

In an examination out of 560 students, 80% of the girls and 70% of the boys passed. If total percentage of passed students was 75%, then which one of the following is not correct?

Given total number of students=560 % of passed students=75%
∴ Total number of students who passed the examination=
∴ Choice (c) is correct. Let the number of boys be
According to problem, we have 70% of of
⇒
⇒number of boys= and number of girls=560280=280
As number of boys=number of girls
Again there are 280 boys and 280 girls ∴ Number of boys passed in the examination
=of
Also, number of girls passed in the examination =80% of 280=8×28=224
∴ Choice (b) is also correct
As No. of boys=No. of girls, ∴ Choice (d) is not correct.