In a college, 45% of the students are boys. If 40% of the boys and 20% of the girls went on a picnic, what percentage on the total students went to the picnic?

A 18%

B 24%

C 29%

D 30%

Correct Answer: Option C

45% of the students are boys

So, 55% of the students are girls

40% of the boys and 20% of the girls

= 40% of 45% of the students + 20% of 55% of the students