In a class of 1500 students, the percentage of girls is 30%. If 80% of the boys failed the examination, find the number of boys who passed in the examination.

210

70% = $\frac{7}{10}$ & 20% = $\frac{1}{5}$ 

Number of boys  = 70% of 1500

= $\frac{7}{10}$ × 1500 = 1050

As , 80% of boys failed the examination

Number of Passed boys = 20% of 1050

=  $\frac{1}{5}$ × 1050

= 210