Question
The average height of a group of boys was 130 cm. After 3 girls with a total of 438 cm joined the group, the average height of all the students increased to 136 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 130 cm. After 3 girls with a total of 438 cm joined the group, the average height of all the students increased to 136 cm.
  1. What was the average height of the girls?
  2. How many boys were there in the group?