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Reena has pens and pencils which togethe...

Reena has pens and pencils which together are 40 in number. If she has 5 more pencils and 5 less pens, then number of pencils would become 4 times the number of pens. Find the original number of pens and pencils.

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Let number of pens `=x`
And number of pencils `=y`
`\Righarrow x+y=40`
...
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