Question
The average height of a group of boys was 139 cm. After 5 girls with a total of 755 cm joined the group, the average height of all the children increased to 140 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 139 cm. After 5 girls with a total of 755 cm joined the group, the average height of all the children increased to 140 cm.
  1. What was the average height of the girls?
  2. How many boys were there in the group?