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1. When a student weighting 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. 57 kgs
- B. 57 kgs
- C. 57 kgs
- D. 57 kgs
Answer: Option A
Explanation:
Let, Average weight of 59 students = x kg
Total weight of 59 students = 59x
Total weight of 60 students = (59x + 45)
Average weight of 60 students = ( 59x + 45)/60
x - ( 59x - 45)/60 = 200/1000
( 60x - 59x - 45) /60 = 1/5
5x - 225 = 60
x = 285 /5 = 57kgs
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