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(a)
shaded area : unshaded area : total
3 : 4 : 7
6u : 8u : 14u (triangle)

3 : 1 : 4
18u : 6u : 24u (circle)

12u : 9u : 21u (rectangle)

total shaded area : total unshaded area ——- 12 + 6 : 9 + 6 + 8 = 18 : 23

(b)
24u ——- 120
1u ——- 120/24 = 5
18u + 23u = 41u ——- 41 x 5 = 205

Ans : (a) 18 : 23; (b) 205 sq cm.

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