[Question]: Abe finds 4 ants on the sidewalk. Beth sees 50% more ants than Abe. CeCe watches twice as many ants as Abe. Duke discovers half as many ants as Abe. How many ants do the four children find together?
[Answer]: Beth finds 4 + 2 = 6 ants. CeCe finds 4 x 2 = 8 ants. Duke finds 4 / 2 = 2 ants. The four children find 4 + 6 + 8 + 2 = 20 ants.
So the answer is 20.

[Question]: Jed is 10 years older than Matt. In 10 years, Jed will be 25 years old. What is the sum of their present ages?
[Answer]: Jed is 25 - 10 = 15 years old now. So, Matt is 15 - 10 = 5 years old now. Thus, the sum of their present ages is 15 + 5 = 20.
So the answer is 20.

[Question]: At the park, Dimitri saw families riding bicycles and tricycles. Bicycles have two wheels and tricycles have three wheels. 6 adults were riding bicycles and 15 children were riding tricycles.  How many wheels did Dimitri see at the park?
[Answer]:

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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Dimitri saw 2 x 6 = 12 wheels on the bicycles. He saw 15 x 3 = 45 wheels on the tricycles. He saw a total of 12 + 45 = 57 wheels.
So the answer is 57.