Question
The average mass of a group of students is 39 kg. If one more student who weighs 63 kg joins the group, the new average mass of the group will become 47 kg. Find the total number of students in the group.
3 m

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The average mass of a group of students is 39 kg. If one more student who weighs 63 kg joins the group, the new average mass of the group will become 47 kg. Find the total number of students in the group.