Question 70

The average height of 5 boys is 175 cm. A sixth boy joined the group and the average height of all the boys in the group now increased by 1 cm. The height of the sixth boy is:

Solution

The average height of 5 boys = 175 cm

Average = sum of all terms/number of terms

Sum of the height of 5 boys = 175 $$\times$$ 5 = 875

Average height after joining of 6th boys = 175 + 1 = 176

Sum of the height of 6 boys = 176 $$\times$$ 6 = 1056

Height of 6th boy = 1056 - 875 = 181 cm

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