The average weight of 21 boys was recorded as 64 kg. If the weight of the teacher was added, the average increased by 1 kg. What was the teacher’s weight?
A. 86 kg
B. 64 kg
C. 72 kg
D. 84 kg
Answer: Option A
Solution(By Examveda Team)
Average weights of 21 boys = 64 kgTotal weights of 21 boys
= 64 × 21
= 1344 kg
The weight of the teacher was added then average increase by 1 kg
⇒ Total weight of teacher and 21 boys
= 65 × 22
= 1430 kg
∴ Weight of teacher
= 1430 - 1344
= 86 kg
This Question Belongs to Arithmetic Ability >> Average
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Comments ( 2 )
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It should be 65×22{since weight of teacher is added to the 21 boys
65×21=1365 not 1430.....try again and use another method.. I m confuse to see ths