The ratio of boys to girls in an art class is 3:5 There are 12 boys in the class. How many girl are in the class?
1 Answer
Nov 30, 2016
Explanation:
We can solve this using fractions in ratio form.
Let x be the number of girls.
#"boys" rarr 3/12=5/x larr" girls"#
#color(blue)"cross-multiply"#
#rArr3x=(12xx5)#
#rArr3x=60# To solve for x, divide both sides by 3
#(cancel(3) x)/cancel(3)=60/3#
#rArrx=20# That is, there are 20 girls in the class.
Check :
#12/20=3/5" or " 3:5#
