Question

If A:B=1:3,B:C=5:7and C:D=9:7,then what ratio is equal to A:B:C:D ?

Answer 1

A:B:C:D=1*5/3:5:7:7*7/9
A:B:C:D=15:45:63:49

Answer 2

A : B = 1 : 3

B : C = 5 : 7

We need to make ratios in cases equal. So, B can have 15 but at the stage C can't have same ratio

LCM of 7 , 9 is 63

To obtain 63 ; B : C = 45 : 63 and C : D = 63:49

Now we have B as 45 ,so A : B = 15 : 45

Finally, A : B : C : D = 15 : 45 : 63 : 49