Question: Sam and Drew have a combined age of 54. Sam is half of Drew's age. How old is Sam?
Answer: Let x be Drew's age. Sam is (1 / 2)x. x + (1 / 2)x = 54. (3 / 2)x = 54. 3x = 108. x = 36. Sam is 36 / 2 = 18 years old. The answer is 18.
[Question]An animal shelter is having a pet adoption event where owners can adopt an animal for just the cost of the vet fees. Vet fees for dogs are $15, and vet fees for cats are $13. Eight families adopt dogs and three adopt cats. The vet donates a third of the fees they were paid for the adoption checkups back to the shelter. How many dollars did the vet donate?
[Answer]The vet made 8 * 15 = $120 in dog vet fees. The vet made 3 * 13 = $39 in cat vet fees. The total vet fees were 120 + 39 = $159. The vet donated 1 / 3 of the fees, so they donated 159 / 3 = $53 back to the shelter. The answer is 53.
Q: Scout delivers groceries on the weekends. His base pay is $10.00 an hour. He also earns a $5.00 tip per customer that he delivers groceries to. On Saturday he worked 4 hours and delivered groceries to 5 people. Sunday he worked 5 hours and delivered groceries to 8 people. How much did he make over the weekend?
A: He worked 4 hours on Saturday and 5 hours on Sunday for a total of 4 + 5 = 9 hours. His base pay is $10.00 an hour and he worked 9 hours for a total of 10 * 9 = $90.00. He delivered groceries to 5 people on Saturday and 8 people on Sunday for a total of 5 + 8 = 13 deliveries. He makes $5.00 per delivery and he delivered to 13 people so he made 5 * 13 = $65.00. His base pay is $90.00 and he made $65.00 in tips for a total of 90 + 65 = $155.00. The answer is 155.
Question: Milton has some books about zoology and 4 times as many books about botany. If he has 80 books total, how many zoology books does he have?
Answer: Let z be the number of zoology books and b be the number of botany books. We know that z + b = 80 and b = 4z. Substituting the second equation into the first equation, we get z + 4z = 80. Combining like terms, we get 5z = 80. Dividing both sides by 5, we get z = 16. The answer is 16.
[Question]Gunther can type 160 words every 3 minutes and he works 480 minutes per day. How many words can Gunther type in a working day?
[Answer]Gunther can type 480 / 3 = 160 sets of 160 words per 3 minutes. Therefore, he can type 160 x 160 = 25,600 words per day. The answer is 25600.
[Question]Mrs. Thomson received an incentive worth $240. She spent 1/3 of the money on food and 1/5 of it on clothes. Then, she put in her savings account 3/4 of the remaining money. How much money did Mrs. Thomson save?
[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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Mrs. Thomson spent $240 x 1 / 3 = $80 on food. She spent $240 x 1 / 5 = $48 on clothes. So she spent a total of $80 + $48 = $128 on food and clothes. Hence, she had $240 - $128 = $112 left after buying food and clothes. Then, Mrs. Thomson saved $112 x 3 / 4 = $84. The answer is 84.