Question

3. If A:B = 7:5 and B:C = 9:14, find A : C.
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Answer 1

A:C= A:B×B:C,(PUT THE VALUE OF A:BAND B:C OF THE FOLLOWING,

A:C=(7:5)×(9:14)

A:C=(7×9)/(5×14)

A:C=63/70

THEN A:C=9/10

Answer 2

Answer:

A/B = 7/5

B = 5/7 × A

B = 5A/7 ----- (1)

B/C = 9/14

C = 14/9 × B

Substitute (1)

C = 14/9 × 5A/7

C = 10A/9

10A = 9C

A/C = 9/10

A : C = 9 : 10