A) 90
B) 22.5
C) 45
D) None of these
Correct Answer: D
Solution :
Let the tow numbers be \[x\] and \[y\]. and its average \[=\frac{1}{2}\,\left( x+y \right)\] No, by condition, \[\frac{1}{2}\{2x+25)+2y\}=\frac{1}{2}(x+y)+20\] \[\Rightarrow \] \[2x+2y+25=x+y+60\] \[\Rightarrow \] \[x+y=15\] \[\Rightarrow \] \[\frac{1}{2}(x+y)=7.5\] \[\therefore \] Required average = 7.5You need to login to perform this action.
You will be redirected in
3 sec