हल करना a / b = 1/2, b / d = 4/5, d / c = 3/1 | Equatix - Math Solver

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Example

3(r+2s)=2t-4

a⋅(b-2)=3b

3(r+2s)=2t-4

a⋅(b-2)=3b

Question

$$a:b=1:2,b:d=4:5,d:c=3:1$$