When a student weighing 45 dgs left a class , the average weight of the remaining 59 students increased by 200g . What is the average weight of the remaining 59 students ?
- 57 kgs
- 56.8 kgs
- 58.2 kgs
- 52.2 kgs
Answer: 57 kgs
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