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1. The average age of 12 students is 20 years. If the age of one more student is included the average decreases by 1, what is the age of the new student?
- A. 5
- B. 5
- C. 5
- D. 5
Answer: Option B
Explanation:
Total age of 12 students = 12 x 20 = 240 years
New average = 20 - 1 = 19 years
Total age of (12 + 1 = 13) students = 13 x 19 = 247
So, age of the new student = 247 - 240 = 7 years
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