please find the a:d value
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a:b=3:4,b:c = 5: 6,C:d=4:5,
a/b=3/4
b/c =5/6
C/d=4/5
a/bxb/cxc/d=3/4 x 5/6x4/5
a/d=60/120 = 1/2
a/d=1/2
a:d=1:2. ans(b)
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