Consider the Q and A. Q: Trey is hanging wall decorations around his house. He uses a nail for each of two-thirds of them, a thumbtack for each of two-fifths of the rest, and a sticky strip for each of the other decorations. He used 15 sticky strips. How many nails did Trey use?
A: 50
What is the step-by-step reasoning process?
Step-by-step reasoning process: Trey used 15 sticky strips for 3 / 5 of the remaining decorations after using nails, so he used 15 *  / 3 / 5 = 25 thumbtacks and sticky strips. The 25 decorations were 1 / 3 of the total decorations, so he used 25 / 1 / 3 = 75 total decorations. The nails were 2 / 3 of the decorations, so Trey used 75 decorations * 2 / 3 = 50 nails.

Consider the Q and A. Q: Clive opens a box full of different colored balls.  The box contains 6 blue balls, 4 red balls, 3 times as many green balls as blue ones and twice as many yellow ones as red ones.  How many balls are in the box Clive opens?
A: 36
What is the step-by-step reasoning process?
Step-by-step reasoning process: There are 3 times as many green balls as blue balls so green balls = blue balls * 3. Green balls = 6 blue balls * 3 = 18 green balls. There are 2 times as many yellow balls as red ones so yellow balls = red balls * 2. Yellow balls = 4 red balls * 2 = 8 yellow balls. The total number of all the balls is 6 blue + 4 red + 18 green + 8 yellow: 6 + 4 + 18 + 8 = 36 balls.

Consider the Q and A. Q: The novel that everyone is reading for English class has half as many pages as their history book. Their science book has 4 times the amount of pages as their novel. If the history book has 300 pages, how many pages does their science book have?
A: 600
What is the step-by-step reasoning process?
Step-by-step reasoning process: Their novel is half as long as their 300 - page history book so it is 300 / 2 = 150 pages. Their science book has 4 times the amount of pages as their novel, which is 150 pages, so their science book has 4 * 150 = 600 pages.

Consider the Q and A. Q: Tim's cat bit him. He decided to get himself and the cat checked out. His doctor's visits $300 and insurance covered 75%. His cat's visit cost $120 and his pet insurance covered $60. How much did he pay?
A: 135
What is the step-by-step reasoning process?
Step-by-step reasoning process:

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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The insurance covers 300 * .75 = $225. So he had to pay 300 - 225 = $75. The cats visit cost 120 - 60 = $60. So in total he paid 75 + 60 = $135.