Question
The average height of a group of girls was 135 cm. After 5 boys with a total of 785 cm joined the group, the average height of all the students increased to 146 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 5 boys with a total of 785 cm joined the group, the average height of all the students increased to 146 cm.
  1. What was the average height of the boys?
  2. How many girls were there in the group?