Question
The average height of a group of girls was 170 cm. After 3 boys with a total of 546 cm joined the group, the average height of all the students increased to 173 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 170 cm. After 3 boys with a total of 546 cm joined the group, the average height of all the students increased to 173 cm.
  1. What was the average height of the boys?
  2. How many girls were there in the group?