Question
The average mass of a group of students is 49 kg. If one more student who weighs 61 kg joins the group, the new average mass of the group will become 51 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 49 kg. If one more student who weighs 61 kg joins the group, the new average mass of the group will become 51 kg. Find the total number of students in the group.