If A : B = 3 : 4, B : C = 5 : 7 and C : D = 8 : 9 then A : D is equal to:
If A : B = 3 : 4, B : C = 5 : 7 and C : D = 8 : 9 then A : D is equal to
[A]10 : 21
[B]21 : 10
[C]3 : 7
[D]7 : 3
10 : 21
$latex A : D = \frac{A}{D} = \frac{A}{B}\times \frac{B}{C}\times \frac{C}{D}&s=1$
$latex = \frac{3}{4}\times \frac{5}{7}\times \frac{8}{9}&s=1$
$latex => \frac{10}{21} = 10 : 21&s=1$
Hence option [A] is the right answer.
