Q: Mason is three times younger than Sydney and Sydney is six years younger than Mason's father. If Mason is 20 years old, how old is his father?
A: Sydney is 20 * 3 = 60 years old. Mason’s father is 60 + 6 = 66 years old. The answer is 66.
Question: Brian has twice as many tennis balls as Frodo, who has 8 more than Lily. If Lily has 3 tennis balls, how many does Brian have?
Answer: Frodo has 8 tennis balls more than Lily (who has 3), so he has 8 + 3 = 11 tennis balls. Brian has twice as many as Frodo, which makes 11 * 2 = 22 tennis balls. The answer is 22.
[Question]Twenty people pre-bought plane tickets at a price of $155 per ticket. Thirty people bought their plane tickets at the gate and they each paid $200 for their ticket. How many more dollars did the people at the gate pay for their tickets than those passengers that pre-bought their tickets?
[Answer]Pre - bought: 20 people * $155 = $3100. Gate bought: 30 people * $200 = $6000. $6000 - $3100 = $2900. The passengers that paid at the gate paid $2900 more dollars than those who pre - bought their tickets. The answer is 2900.
Q: Lyra has an $80 budget for a week to spend on food. If she bought 1 bucket of fried chicken that costs $12 and 5 pounds of beef that cost $3 per pound. How much is left on her weekly budget?
A: Five pounds of beef cost $3 x 5 = $15. So Lyra spent a total of $12 + $15 = $27. Therefore, $80 - $27 = $53 is left on her weekly budget. The answer is 53.
Question: It takes Dawn 2 hours to paint 1 watercolor painting. She was recently commissioned to paint a series of 12 paintings. Dawn will earn $3,600.00 for these 12 paintings. How much money does Dawn make per hour?
Answer: It takes her 2 hours to paint 1 picture and she needs to paint 12 pictures so it will take 2 * 12 = 24 hours. Dawn will make $3,6000.00 for 24 hours of work which means she makes 3600 / 24 = $150.00 per hour of work. The answer is 150.
Q: Nate is reading a 400-page book. He finished reading 20% of the book. How many pages does he need to read to finish the book?
A:

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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Nate had read 400 x 20 / 100 = 80 pages. So, he still needs to read 400 - 80 = 320 pages to finish the book. The answer is 320.