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unshaded area : total area of A and B
17 : 23

This means,
unshaded area = 17 units
total area of A and B = 23 units

Therefore,
total area of A and B – unshaded area will give you 2 times of the shaded area. (this is because the shaded area is currently being overlapped by part of A and part of B)
23 units – 17 units = 6 units

We now only need to find 1 times of shaded area, so 1 times of shaded area = 6/2 = 3 units

Therefore, the ratio of shaded area : total area of A and B is 3 : 23

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Ans : 3 : 23.

Note :

23 – 17 = 6 (shaded area of Square A + shaded area of Rectangle B)

6/2 = 3 (overlapping shaded area as shown in the figure)

shaded area : total area of Square A and Rectangle B before the overlapping

3 : 23

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Hope this answers your question.

Owlinker
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Original unshaded : now unshaded : “missing” area due to shading :       shaded of A : shaded of B : shaded overlapped area

= 23 : 17 :  23-17 :       6/2 : 3 : 3

= 2317 : 6 :       3 : 3 : 3

answer is 3:23

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