Question

a:b=3:5,b:c=5:6,c:d=4:3 a:d=?

Answer 1

a/b*b/c*c/d=a/d
=3/5*5/6*4/3=2/3
is the answer.

Answer 2

a/b=3/5(a=3,b=5)
b/c=5/6(b=5,c=6)
c/d=4/3(c=4,d=3)
a/d=?
By comparing a/d you will get
a=3 and d=3
so,
a/d=3/3=1
Hope it helps..