Question

In a school,4/9 of the students are boys and the number of girls is 775.find the number of boys in the school.

Answer 1

620 is the answer?????

Answer 2

If 4/9 of the students are boys of the total and girls are 775 then,

Total no. of boys in class =
$\frac{4}{9} x$
Total no.of girls =
$\frac{5}{9} x$
Also, total no. of girls= 775.

$\frac{5}{9} x = 775 \\ x = \frac{775 \times 9}{5} \\ x = 1395$
Put it in boys :
$\frac{4}{9} x \\ = \frac{4}{9} (1395) \\ = 4 \times 155 \\ = 620$