Question

If A:B = 3:5 and B: C = 8:11, find A:C ​

Answer 1

Answer:

A/B = 3x /5x

B/C = 8 x/11x

AC = A/B * B/C

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Answer 2

a : b  = 5 : 9

b : c  =      4 : 7

Observe that the figures against b are 9 and 4 .

Find LCM of 9 and 4. This is 36.

Now make figures in both ratios such that figure against b is 36.

Therefore a : b = (Multiply by 4) 5x4 : 9x4 = 20 : 36

                B : c = (multiply by 9) 4x9 : 7x9 =        36 : 63

When figure against b is made same (as b =36 above),

Ratio a : b : c = 20 : 36 : 63

and a :c = 20 : 63

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