The average weight of 50 people is 40 kg. If one person leaves the group and the average decreases by one, what is the weight of the person who left?
A79 kg
B59 kg
C49 kg
D89 kg
A79 kg
B59 kg
C49 kg
D89 kg
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The average of 15 students in a class is 43. If each student's marks are doubled, what is the new average?