Question: Viggo spent $80 on a shirt. He paid the shirt using $20 and $10 bills. If she gave the clerk one more $20 bill than $10 bills, how many $10 bills did he give?
Answer with step-by-step thinking: Let x be the number of $10 bills. So, there are (x + 1) $20 bills. Adding the $10 and $20 bills should sum up to $80 so the equation is 10x + 20(x + 1) = 80. Then, distribute 20 to x + 1 so it becomes 10x + 20x + 20 = 80. Combining the like terms on the left side gives 30x + 20 = 80. Then transfer 20 to the right side of the equation, so it becomes 30x = 60. To solve for x, we have 60 / 30 = 2. Therefore, there are 2 $10 bills.
So the answer is 2.

Question: Jaron wants to raise enough money selling candy bars to win the Nintendo Switch prize. He needs 2000 points for the Nintendo Switch. He has already sold 8 chocolate bunnies that are worth 100 points each. Each Snickers bar he sells earns 25 points. How many Snickers bars does he need to sell the win the Nintendo Switch?
Answer with step-by-step thinking: Jaron has earned a total of 8 * 100 points = 800 points. To win the Switch he needs to earn 2000 - 800 = 1200 points. Therefore, he needs to sell 1200 / 25 = 48 Snickers bars.
So the answer is 48.

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?
Answer with step-by-step thinking:
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.
So the answer is 750.