Bunuel wrote:
When a student weighing 45 kgs left a class, the average weight of the remaining 59 students increased by 200g. What is the average weight of the remaining 59 students?
A. 45
B. 49
C. 57
D. 64
E. 65
Let, Average of 59 students = x
Total of 59 students = 59x
Total of 60 students = 59x+45
Average of 60 students = (59x+45)/60
now, x- 0.2 = (59x+45)/60
60x-12 = 59x+45
i.e. x = 57
Answer: Option C
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