20. (a) In the figure (l) given below, AB, EF and CD are parallel lines. Given that 
AB = 15 cm, EG = 5 cm, GC = 10 cm and DC=18 cm. Calculate  (b) In the figure (2) given below, AF, BE and CD are parallel lines. Given that AF- 7.5 cm, CD = 4.5 cm, ED = 3 cm, BE = x and AE = y. Find the x and y.

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