Question
The average height of a group of boys was 119 cm. After 4 girls with a total of 516 cm joined the group, the average height of all the children increased to 123 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 119 cm. After 4 girls with a total of 516 cm joined the group, the average height of all the children increased to 123 cm.
  1. What was the average height of the girls?
  2. How many boys were there in the group?