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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) 7 c) 9 d) 11
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- ANS B
Average age of 12 students is 20 years means sum of 12 students age is 240
If the age of one more student is included, the average decreases by 1, means 13 students age is 13*19 =247
Difference between 12 and 13 students is 7. - 12 years agoHelpfull: Yes(2) No(2)
- b)7
Total age of 12 students = 12*20 = 240 (Since average is 20)
After one more student included, average decreases by 1.
It means, Average age of 13 students = 19
Total age of 13 students = 19*13 = 247
Therefore, age of 13th student = 247-240 = 7yrs. - 12 years agoHelpfull: Yes(1) No(2)
- 12*20=240
13*19=247
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ans 7 - 6 years agoHelpfull: Yes(0) No(1)
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