The average height of each person in group 'C' having 25 people is 10 cm less than the average height of each person in group 'D' having 20 people. If the sum of the heights of all people in group 'C' is the same as that in group 'D', then what is the average height of a person in group 'D'?
ATQ, Let the average height of a person in group 'D' = 'y' cm. Then, the average height of a person in group 'C' = (y - 10) cm. Total height of all people in group 'D' = 20 × y = '20y' cm. Total height of all people in group 'C' = 25 × (y - 10) = 25y - 250 cm. So, 25y - 250 = 20y. Or, 5y = 250. So, y = 250 / 5 = 50. Required average height = 50 cm.
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