Wipro
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Numerical Ability
Averages
The average age of 30 students is 9 years. If the age of their teacher is included, it becomes 10 years. The age of the teacher (in years) is :
a. 27
b. 31
c. 35
d. 40
Read Solution (Total 3)
-
- (31*10) - (30*9) = 40
- 7 years agoHelpfull: Yes(3) No(0)
- 30*9 =270
31*10=310
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Ans: 310-270=40 - 6 years agoHelpfull: Yes(1) No(0)
- 9=sum of ages of students/30
or, sum of ages of students=270
now, 10=(270+their teacher age)/(30+1)
or, 270+their teacher age=310
or, their teacher age=40 years. - 5 years agoHelpfull: Yes(0) No(0)
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