Question
The average height of a group of boys was 144 cm. After 4 girls with a total of 608 cm joined the group, the average height of all the pupils increased to 146 cm.
  1. What was the average height of the girls?
  2. How many boys were there in the group?
3 m
(a)

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(b)

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The average height of a group of boys was 144 cm. After 4 girls with a total of 608 cm joined the group, the average height of all the pupils increased to 146 cm.
  1. What was the average height of the girls?
  2. How many boys were there in the group?