A:B = 5:6, B:C = 7:8, and C:D = 9:10. Find the ratio A:D.
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Correct answer: A
Explanation
Given:
A : B = 5 : 6
B : C = 7 : 8
C : D = 9 : 10
To equalize B
A : B = 35 : 42
B : C = 42 : 48
C : D = 9 : 10
To equalize C
A : B : C = 315 : 378 : 432
C : D = 432 : 480
A : D = 315 : 480 = 21 : 32