Question

If a : b = 2 : 3 and b : c = 5 : 7, find a : b : c​

Answer 1

A:B=3:4

Let A be 3k and B be 4k.

B:C=5:7

Let B be 5x and C be 7x

4k=5x

x=4k/5

A:B:C=3k:4k:7x

=3k:4k:7( 4k/5)

=15k:20k:28k

=15:20:28

Hence A:B:C=15:20:28

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Answer 2

Answer:

10:15:21

Step-by-step explanation:

(2:3)*5= 10:15

(5:7)*3= 15:21

therefore a:b:c=10:15:21