Question
The average height of a group of boys was 131 cm. After 9 girls with a total of 1278 cm joined the group, the average height of all the students increased to 132 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 131 cm. After 9 girls with a total of 1278 cm joined the group, the average height of all the students increased to 132 cm.
  1. What was the average height of the girls?
  2. How many boys were there in the group?