Question: Julie, Letitia and Anton decided to have dinner together at a nearby restaurant. Julie orders $10 worth of food, Letitia orders $20 worth of food, and Anton orders $30 worth of food. How much should each pay in tips if they want to split a 20% tip for the whole meal evenly?
Answer: First, we need to determine how much the entire meal costs before we can determine the tip. We perform 10 + 20 + 30 = 60 dollars worth of food. Now we need to find out how much the total tip to be paid is, by multiplying 60 * .2 = 12 dollars in tips. Since they want to split this evenly amongst three people, this works out to 12 / 3 = 4 dollars in tips per person. The answer is 4.

Question: There are 3 bicycles, 4 tricycles and 7 unicycles in the garage at Zoe's house. Each bicycle has 2 wheels, each tricycle has 3 wheels and each unicycle has 1 wheel. How many wheels are there in all?
Answer: The number of bicycle wheels is 2 3 = 6. The number of tricycle wheels is 3 4 = 12. The number of unicycle wheels is 1 7 = 7. The total number of wheels is 6 + 12 + 7 = 25. The answer is 25.

Question: Michael has 2 cats and 3 dogs. He needs to pay a friend to watch them, who charges $13 a night per animal. How much does Michael have to pay?
Answer: Michael has 5 animals because 2 + 3 = 5. Michael has to pay $65 because 5 x $13 = $65. The answer is 65.

Question: 40% of the mosquitos in Jack's area are infected with malaria. 20% of the mosquitos are infected with Zika virus. Without a vaccine, the chances of getting infected with either virus after getting bitten by an infected mosquito are 50%. Jack is taking an experimental malaria vaccine that reduces the chances of getting infected after getting bitten by 50%. If Jack gets bitten by a random mosquito, what is the percentage chance he catches either Zika virus or malaria?
Answer:
First find Jack's chances of getting bitten by an infected mosquito: 40% + 20% = 60%. The chance of being infected by a mosquito with after being bitten: 60% * 50% = 30%. Then find the chances of getting ill after receiving the vaccine: 30% * 50% = 15%. The answer is 15.