Of the 15-year-olds at a karate school, 9 have black belts and 15 have brown belts. Among the 16-year-olds, 11 have black belts and 20 have brown belts. Which age group has a higher ratio of black belts to brown belts?

Answer:15 years olds group had a higher ratio of black belts to brown belts.

Solution:

15 years olds group ratio:

black belts:brown belts

9 : 15

= 3:5

by fraction: 3/5 = 1.5

16 years olds group ratio:

black belts:brown belts

11 : 20

by fraction:11/20 = 0.55