A) 50 yr
B) 55 yr
C) 58 yr
D) 60 yr
Correct Answer: B
Solution :
Let the age of retired teacher \[=x\,yr\] and average of 10 teachers \[=y\,yr\] \[\therefore \] Total of 10 teachers \[=10y\] Total of 10 teachers including a new teacher. \[=(10y-x+25)yr\] \[\therefore \] \[y-3=\frac{10y-x+25}{10}\] \[\Rightarrow \] \[10y-30=10y-x+25\] \[\Rightarrow \] \[x=55\] \[\therefore \] Age of retired teacher \[=55\,yr\]You need to login to perform this action.
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