Jessica fills an aquarium with water. The aquarium can hold gallons of water—it's a huge aquarium! The faucet fills the tank at a rate of 1 gallon every 10 seconds. How long (in seconds) will it take Jessica to fill the tank?

If painters can paint houses in day, how many painters would it take to paint houses in day?

I put in a bank account at a annual simple interest rate. How much interest will have accumulated after two years?

If one recipe calls for eggs to make waffles, how many eggs are needed to make waffles?

If a car travels at miles per hour, how many hours would it take the car to travel miles?

The ratio of boys to girls in a class is . If there are boys in the class, how many girls are in the class?