Question

Out of $2400$ students in a school 45 % are girls and rest boys. If 30 %of the boy and 70 % of the girls are vegetarian, then :

How any students in all are vegetarian?
What percent of the total number of students are vegetarian?

Answer 1

No.of girls$=2400\times 45\%=1080$

No.of boys$=2400\times 55\%=1320$

No.of vegetarian boys$=1320\times 30\%=396$

No.of vegetarian girls$=1080\times 70\%=756$

$\left(1\right)$ total no.of vegetarian students$=396+756=1152$

$\left(2\right)$ Required percentage $=\frac{1152}{2400}\times 100=48\%$.