The area of a trapezium is 480 cm2, the distance between two parallel sides is 15 cm and one of the parallel side is 20 cm. The other parallel side is:

44 cm

Area of trapezium = \(\frac{1}{2}\) × h (a + b)
a=20 cm, h = 15 cm, Area = 480 sq.cm
480 = \(\frac{1}{2}\) × (15) (20 + b)
20 + b = \(\frac{480×2 }{15}\)
20 + b = 64
b = 44cm