Question
The average height of a group of girls was 136 cm. After 8 boys with a total of 1200 cm joined the group, the average height of all the students increased to 140 cm.
  1. What was the average height of the boys?
  2. How many girls were there in the group?
3 m
(a)

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(b)

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The average height of a group of girls was 136 cm. After 8 boys with a total of 1200 cm joined the group, the average height of all the students increased to 140 cm.
  1. What was the average height of the boys?
  2. How many girls were there in the group?