2/5 of class are boys .There 10 girls more than boys . How many boys are there ?
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let the total no of students be x.
no of boys = 2/5 of total students = 2x/5
no of girls = x - 2x/5=3x/5
given :
no. of girls = 10+ no of boys
3x/5 = 10+ 2x/5
3x/5 - 2x/5 = 10
x/5 = 10
x = 5*10 = 50 = total no of students
no of boys = 2/5 * 50 = 20
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