Question

If 70% of the students in a school are boys and the number of girls is 540,find the number of boys in the school?use unitary method

Answer 1

If 70% are boys, 30% are girls.
therefore 30% of the total number of students= 540
Let total no.of student in school be =x
therefore, 30/100 × x=540
=3x=5400
=x=1800

therefore number of boys=1260

Answer 2

total strength = x
boys%=70
girls=100-70=30%
no.of girls =540
30%ofx=540
x=30/100×x=540
x=540×10/3=1800
the no.of boys present in the class=
1800_540
=1260