Reena has pend and pencils which together are 40 in number. If she has 5 more pencils and 5 less pens, the number of pencils would become 4 times the number of pens. Find the original number of pens and pencils.
$x-4 y+25=0$$\ldots \ldots(2)$
Substituting the value of y from equation 1 in equation 2 we get
$x-4(40-x)+25=0 \quad[y=(40-x)$ from equation 1$]$
Substituting the value of y in equation 1 we get
Hence we got the result number of pencils is $x=27$ and number of pens are $y=13$