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Question

**Dear Teachers, please help to solve this question. Thank you.

Answer

A : B
1 : 4

A : C
3 : 4

A : B : C
3 : 12 : 4

12/3 = 4
4 x 4 = 16 (area of D)
16/(3 + 12 + 4 + 16) = 16/35

Ans : 16/35.

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Let A = 3, 

so, B is 12, as A is 1/4 of B;

and C is 4, as A is 3/4 of C;

and D is 16, as D is 4 times of C;

total area is 3+4+12+16=35

so D to overall area is 16/35

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