The average weight of a group of students is 39 kg. The average weight of the boys is 43 kg and that of the girls is 34 kg. If there are 25 boys, find the number of girls.
Explanation:
Let the number of girls in the group be x.
Then, 25×43+34x25+x = 39.
⇒ x = 20
Hence, option (a).
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