In a classroom the average height of all the boys was 170 cm. kranthi recently join the class which originally had 20 boys increased the average to 171cm. Then find the height of kranthi.
Before Kranthi joined the total height of all the boys = 160 X 10 = 1600.New average = (Total height of all students + height of Kranthi)/21 = 180 Therefore (3400 + height of Kranthi)/21 = 171
height of Kranthi = 3780 - 3400 = 191 cms.
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