5/9 = x/180
9x = 900
x = 100
The ratio of boys to girls in a graduation class is 5:4. If there are 153 pupils in this class, how many boys are there?
3 answers
boys : girls = 5 : 4 or 5x : 4x
then 5x + 4x = 153
9x = 153
x = 17
5x = 85
4x = 68
there are 85 boys in the class
check:
85+68 = 153 , check!
85 : 68
= 5 : 4, check
then 5x + 4x = 153
9x = 153
x = 17
5x = 85
4x = 68
there are 85 boys in the class
check:
85+68 = 153 , check!
85 : 68
= 5 : 4, check
Aaarrgghh! My demon dead brain cell pulled up 180 out of nowhere. (shaking head!)
Thanks for rescuing us, Reiny!
Thanks for rescuing us, Reiny!