19
The average of ten numbers is 18. If one number is removed, then the average becomes 16, then what is the removed number?
- A36
- B40
- C48
- D52
Answer not set
Discussion 1
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CCommunity
Average = sum of 10 numbers/10
⇒ 18 = sum of 10 numbers/10
⇒ Sum of 10 numbers = 180
And, Average when the number is removed = sum of 9 numbers/9
⇒ 16 = sum of 9 numbers/9
⇒ Sum of 9 numbers = 144
∴ Number removed = 180 - 144 = 36
⇒ 18 = sum of 10 numbers/10
⇒ Sum of 10 numbers = 180
And, Average when the number is removed = sum of 9 numbers/9
⇒ 16 = sum of 9 numbers/9
⇒ Sum of 9 numbers = 144
∴ Number removed = 180 - 144 = 36