A) 11
B) 12
C) 13
D) 14
Correct Answer: C
Solution :
Let the be \[x\] pencils and y pens, then \[x+y=40\] \[\Rightarrow \] \[4x+4y=160\] \[(x+5)=4\,(y-5)\] \[\Rightarrow \] \[x-4y=-25\] \[\therefore \] \[4x+4y=160\] \[x-4y=-25\] \[5x=135\] \[\therefore \] \[x=27\] and \[y=13\]You need to login to perform this action.
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