Question

if A:B = 5:7 and B:C = 7:9, then A:B:C= __​

Answer 1

Step-by-step explanation:

Correct option is

A

15 : 20 : 36

To find a : b : c, b is made same in both the ratios. L.C.M of 4 and 5 is 20

a:b=

4

3

=

4×5

3×5

=

20

15

b:c=

9

5

=

9×4

5×4

=

36

20

∴ a:b:c=15:20:36