Question

Give answer to this
Fast plz

Answer 1

C/D = 1/3

C = D/3

B/C = 3/2

B = 3C/2 = (3* D/3)/2=D/2

A/B = 1/2

A = B/2 = 1/2 * D/2= D/4

now putting value of A B and C

A:B:C:D = D/4 : D/2 : D/3 :D

Taking D common out

A:B:C:D = 1/4 : 1/2 : 1/3 :1

multiplying eachone with 12

A:B:C:D = 12/4 : 12/2 : 12/3 :12

= 3:6:4:12