The ratio of Sylvia's age to Bob's age is 3 to 7. The ratio of Sylvia's age to Joe's is 4 to 9. The ratio of Bob's age to Joe's is:

Question

A. 28 to 27
B. 7 to 9
C. 27 to 18
D. 10 to 13

Answer 1

S:J = 4:9
S:B = 3:7

multiply both ratios to get 12

S:J = 12:27
S:B = 12:28

B:J = 28:27