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:
Answer & explanation
Correct answer: option 2
Sum of heights of 5 boys = 5 x 175 = 875 cm
Sum of heights when 6th boy joins the group = 6 x 176 = 1056 cm
Height of 6th boy = 1056 - 875 =181 cm