Question

is 55% of the students in a school are boys and the number of girls in 900 find out number of boys

Answer 1

METHOD-1
let the total number of students be x

hence 55% are the boys on total strength

then boys become x*55/100
=11x/20
then the equation is 11x/54+900=x
x-11x/54=900
43X/54=900

METHOD-2

IF BOYS ARE 55% then girls are 45 %
then 45 %of 900 is
45/100*900= 405

then 900-405=495

Answer 2

Answer:

Let the total number of students be x.

Percentage of boys = 55 %

percentage of girls = (100 - 55) % = 45 %

Number of girls = 45% of x

⟹ $\dfrac{45}{100} \times x$

⟹ $\dfrac{9x}{20}$

Number of girls = 900

⟹ $\dfrac{9x}{20}$ = 900

⟹ $x = \dfrac{900 \times 20}{9}$ = 2000

Number of boys = 55% of 2000

⟹$\dfrac{55}{100} \times 2000$

⟹ 1100

Hence, the number of boys is 1100