The average of 20 numbers is 12. The average of the first 12 numbers is 11 and that of the next 7 numbers is 10. The last number is ?
A. 40
B. 38
C. 48
D. 50
Answer: Option B
Solution (By Examveda Team)
Let the last number = xAccording to the question,
⇒ 12 × 11 + 7 × 10 + x = 20 × 12
⇒ 132 + 70 + x = 240
⇒ x = 240 - 202
⇒ x = 38
This Question Belongs to Arithmetic Ability >> Average
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