Question

The ratio of boys to girls riding on a school bus is 4:3. If there are 56 total students on the bus, how many girls are on the bus?

Answer 1

Boys : girls 
   4 .  :   3

Total Share = 4 + 3 = 7
Total students = 56

------------------------------------------------------------------------------------------------------
Find 1 share of the ratio
------------------------------------------------------------------------------------------------------
7 shares = 56
1 share = 56 ÷ 7
1 share = 8

------------------------------------------------------------------------------------------------------
The girls made up 3 shares in the ratio. Find 3 shares:
------------------------------------------------------------------------------------------------------
1 share = 8 
3 shares = 8 x 3
3 shares = 24 

------------------------------------------------------------------------------------------------------
Answer: There are 24 girls on the bus.
------------------------------------------------------------------------------------------------------

Answer 2

1) 4+3= 7 parts,
56/7= 8 is one part, because girls are 3 parts then 3*8=24
or
2) boys =4x, girls =3x
4x+3x=56,    7x=56, x=8
girls =3x=3*8=24
girls =24