Question

A:b = 3:4, b:c = 5:6, c:d = 11:9, then a:d=.......
pls explain with a solution
options are
a) 50:60
b) 55:72
c) 60:70
d) 65:75

Answer 1

multiply all the ratio

a:d = 3×5×11:4×6×9

=> 55:72

option b