Question
The average mass of a group of students is 42 kg. If one more student who weighs 74 kg joins the group, the new average mass of the group will become 50 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 42 kg. If one more student who weighs 74 kg joins the group, the new average mass of the group will become 50 kg. Find the total number of students in the group.