Question

Find A:B:C:D when A:B = 2:3 ; B:C = 7:9 ; C:D = 5:7

Answer 1

Given a:b=2:3,b:c=4:5,c:d=6:7

a:b=2×8:3×8=16:24

b:c=4×6:5×6=24:30

c:d=6×5:7×5=30:35

so a:b:c:d=16:24:30:35

Answer 2

Answer:

A=2*7*5=70

B=3*7*5=105

C=3*9*5=135

D=3*9*7=189

A:B:C:D=70:105:135:188