Stream of consciousness rationale: Addie put 72 / 4 = 18 stamps in the scrapbook. Parker now has 18 + 18 = 36 stamps in his scrapbook.
The question and answer pair are described below.
Q: There were 18 stamps in Parker's scrapbook. If Addie put one fourth of her 72 stamps in Parker's scrapbook, how many stamps does he have now?
A: 36