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Answer

(a) For this question, pls take note that  area of M + N = P + Q = R + S

M : N : P = 5 : 7 : 8

If area of M is 5u cm², M+N = 12u cm²

Q : R : S = 2 : 1 : 5 = 4 : 2 : 10

So now P + Q = 12u and R + S = 12u

So N : S = 7 : 10

(b) N- Q = 7u – 4u = 291

3u = 291

12* 3u = 36u = 12 * 291 = 3492

The area of the big rectangle is 3492 cm²

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Thank you!

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