Reasoning and answer: First find the total number of liters a mosquito sucks in one feeding: 20 drops / 5000 drops / liter = .004 L / feeding. Then divide the lethal amount of blood by the amount of blood one mosquito can drain: 3 L / .004 L / feeding = 750 feedings.
The answer: 750
What was the question?
Question: A mosquito sucks 20 drops of blood every time it feeds on someone. If there are 5000 drops per liter and you have to lose 3 liters of blood to die, how many mosquitoes would have to feed on you to kill you?


There are 10 students in Liam's art class and 1 / 2 of them make a different amount of artworks than the other half, 1 / 2 x 10 = 5 students. 5 students make 3 artworks each, 5 x 3 = 15 artworks. The other 5 students make 4 artworks each, 5 x 4 = 20 artworks. Combined, the students in the class make 15 + 20 = 35 artworks.
The answer: 35
Reverse engineering the question: Liam is teaching art to a group of 10 students. He has 20 art kits that he hands out to the students to share, 1 art kit for 2 students. From those art kits half the students make 3 artworks each and half the students make 4 artworks each. How many artistic works does the whole class create?


Reasoning and answer: First find the total number of legos on the bottom layer: 7 legos * 7 legos = 49 legos. Then find the number of legos per side on the next layer: 7 legos - 1 lego = 6 legos. Then find the total number of legos on the second level: 6 legos * 6 legos = 36 legos. Then find the number of legos per side on the top level: 6 legos - 1 lego = 5 legos. Then find the total number of legos on the top level: 5 legos * 5 legos = 25 legos. Then add the number of legos on each level to find the total number of legos: 49 legos + 36 legos + 25 legos = 110 legos.
The answer: 110
What was the question?
Question: Bob wants to build a pyramid out of legos with 3 levels where the bottom level has 7 legos per side and each level has one less lego per side than the level below it. How many legos total will he need?


The shark went from 20 miles per hour to a speed of 2 * 20 = 40 miles per hour. The shark increased its speed by 40 - 20 = 20 miles per hour. Half of the shark's increase in speed is 20 / 2 = 10 miles per hour. Thus the pilot fish had increased its speed to 20 + 10 = 30 miles per hour.
The answer: 30
Reverse engineering the question: Keanu was surfing towards the shore at a speed of 20 miles per hour. A shark was swimming alongside him, riding the same wave, when it doubled its speed and moved away from Keanu. There was a pilot fish swimming alongside Keanu and the shark, and when the shark increased its speed, the pilot fish also increased its speed and moved away from Keanu, but only increasing its speed by half as much as the shark had increased its speed by. What speed, in miles per hour, was the pilot fish swimming when it moved away from Keanu?


Reasoning and answer: On Saturday, she sold 2 * 30 = 60 boxes. On Sunday, she sold 60 - 15 = 45 boxes. She sold a total of 30 + 60 + 45 = 135.
The answer: 135
What was the question?
Question: On Friday, Markeesha sold 30 boxes of crackers for her scout troop's fundraiser. On Saturday, she sold twice as many as on Friday. On Sunday, she sold 15 fewer than Saturday. How many boxes did she sell over the three days?


Reasoning and answer: If Zig wrote 60 books, four times as many books as Flo, Flo wrote 60 / 4 = 15 books. Together, they wrote 60 + 15 = 75 books.
The answer: 75
What was the question?
Question:

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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Zig wrote four times as many books as Flo. If Zig wrote 60 books, how many books did they write altogether?