2600 pens.
the remaining pens Ali have after giving 1547 away.
2600 - 1547
= 1053
so, Ali has 1053 pens with him.
Ali has 2600 pens.
the amount of pens Ali has left after he gave away 1547 pens.
subtract 2600 from 1547.
[tex]2600 - 1547[/tex]
[tex] = 1053 \: pens[/tex]
hence, Ali has 1053 pens left with him after giving 1547 pens away.