Question

In a class of 49 students, number of girls is 2/5 of the boys. Find the number of boys in the class

Answer 1

answer is obtained as above

Answer 2

Let number of boys be x
Number of girls =   $\frac{2}{5}x$
Total number of students = x +  $\frac{2}{5}x$

So according to question,
x + $\frac{2}{5}x$ = 49
 $\frac{7}{5}x$      = 49
                                 x       = 49*$\frac{5}{7}$
                                 x       = 35

Therefore, there are 35 boys.