Ahmed added 69 runs for the third wicket with Shoaib Malik (37 off 28 balls) to lift Pakistan after West Indies won the toss and decided to bowl on a slow Dubai stadium pitch.
Ahmed's knock featured five boundaries while Malik smashed a six and three fours.
Both teams kept the same eleven from Friday's first match which Pakistan won by nine wickets.
Opener Khalid Latif made a 36-ball 40 with three boundaries and a towering six. Babar Azam made 19 and Sharjeel Khan two.
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