Question
The average height of a group of girls was 135 cm. After 4 boys with a total of 572 cm joined the group, the average height of all the students increased to 137 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 135 cm. After 4 boys with a total of 572 cm joined the group, the average height of all the students increased to 137 cm.
  1. What was the average height of the boys?
  2. How many girls were there in the group?