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3.A rectangle is divided into 4 parts, A B, C and D. The areas of A: B: C are in the ratio 10:18:5. C is a square with an area of 25cm2. What is the area of rectangle D?
4. Mr Lee is 38y old. His daughter is 32y younger.
a) In how many years time will Mr Lee be 3x as old as his daugheter?
b) When Mr Lee is 64y old, what will be the ratio of his age to his daughter's age?