Question

If A: B= 3 : 4, B: C = 5: 7 and C: D = 8: 9 then A: D is equal to
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Answer 1

Step-by-step explanation:

A:D => A/D = A/B × B/C × C/D

= 3/4 × 5/7 × 8/9

= 10/21

so, A:D = 10:21

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