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Total area of cirlces
(B+C) : A
= 4:5
= 24:30

1/6 of A shaded -> 1/6 * 30 = 5 units shaded
unshaded A -> 30 units – 5 units = 25 units
unshaded (B+C) -> 24 – 5 = 19 units

Can draw model here, to see clearer.
B has 5 units, C has 3 units. Size of units in B and C are different.
5 units of B + 3 units of C -> 24

1 unit of B + 1unit of C -> 5
3 units of B + 3 units of C ->15

2 units of B -> 24 – 15 = 9
unshaded B = 4 units of B -> 9 * 2 = 18

2 units of C -> 24 – 18 – 5 = 1
unshaded C = 2 units = 1

unshaded
A:B:C
= 25:18:1

Ref: http://www.kiasuparents.com/kiasu/forum/viewtopic.php?p=3307#p3307

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