55%of the students ina school are girls.If the number of boys is1800,find the total strength of the girls.
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Let no. of students = x
No. of girls = 55% of x = 55/100×x
% of boys = 45%
No. of boys = 45% of x = 45/100×x
But no. of boys = 1800
i.e. 45/100×x =1800
x = 1800 × 100/45
x = 4000
No. of girls = no. of students - no. of girls
No. of girls = 4000 - 1800 = 2200
No. of girls = 55% of x = 55/100×x
% of boys = 45%
No. of boys = 45% of x = 45/100×x
But no. of boys = 1800
i.e. 45/100×x =1800
x = 1800 × 100/45
x = 4000
No. of girls = no. of students - no. of girls
No. of girls = 4000 - 1800 = 2200
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