Reasoning and answer: Neil gave 20 x 2 / 5 = 8 cookies. So he is left with 20 - 8 = 12 cookies.
The answer: 12
What was the question?
Question: Neil baked 20 cookies. He gave 2/5 of the cookies to his friend. How many cookies are left for Neil?

Reasoning and answer: Carlton has 2 * 3 = 6 sweater vests. He can wear each sweater vest with different 3 button - up shirts, so Carlton has 3 * 6 = 18 outfits.
The answer: 18
What was the question?
Question: Carlton wears an assortment of sweater vests and button-up shirts. He has twice as many sweater vests as button-up shirts and considers each unique combination of vest and shirt to be an outfit. He owns three button-up shirts. How many outfits does Carlton have?

Reasoning and answer: Let x be the number of pens bought. He bought 12 + 5x pencils. x + (12 + 5x) = 108. 6x + 12 = 108. 6x = 96. x = 16 pens.
The answer: 16
What was the question?
Question:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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Issac has to buy pens and pencils for the upcoming school year. Issac buys 108 writing utensils total. He buys 12 more than 5 times the number of pencils than pens. How many pens did Issac buy?