Question

if 70%of students are boys and 240 girls. How many boys are there

Answer 1

total students are 100%
boys are 70%
total number of students be X
girls are 30% .
number of girls are 240.
(30/100)*X= 240
30x=24000
30x=24000
x= 24000/30
x= 800
total number of students are 800
boys are 70%
(70/100)*800=?

560 number are boys
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Answer 2

let total students =x ,boys =70% of x=7x/10,girls=240 so the sum of 7x/10 +240=x
7x+2400/10=x ,2400=10x-7x ,2400=3x ,
800=x so ,800-240=560
560 are boys