Question
The average height of a group of girls was 146 cm. After 5 boys with a total of 775 cm joined the group, the average height of all the students increased to 149 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 146 cm. After 5 boys with a total of 775 cm joined the group, the average height of all the students increased to 149 cm.
  1. What was the average height of the boys?
  2. How many girls were there in the group?