If A:B = 2:3, B:C = 4:5 and C:D = 6:7, then find the value of A:B:C:D

Question

( A ) 16:24:30:35
( B ) 18:24:30:35
( C ) 15:24:30:35
( D ) 17:24:30:35

Comments

How is come 15 /24