Question
The average mass of a group of girls is 41 kg. If one more girl who weighs 77 kg joins the group, the new average mass of the group will become 50 kg. Find the total number of girls in the group.
3 m

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The average mass of a group of girls is 41 kg. If one more girl who weighs 77 kg joins the group, the new average mass of the group will become 50 kg. Find the total number of girls in the group.