The average number of a, B and C is 72, and the ratio of a, B and C is 3 ∶ 4 ∶ 5. What are the numbers of a, B and C? 20 points online Clock, etc

The average number of a, B and C is 72, and the ratio of a, B and C is 3 ∶ 4 ∶ 5. What are the numbers of a, B and C? 20 points online Clock, etc

72×3 ÷(3+4+5)=18
18 × 3 = 54 A
18 × 4 = 72 B
18 × 5 = 90 C