What is the percent of change from 1,000 to 800?

A manufacturer uses a tank to supply water to his machines while they are working. When the machines are on the tank loses 1.5 gallons of water an hour at the same time 1 gallon of water is pumped into the tank from a well.

The sum of these two numbers is 519

Josh will take 10 tests in 5 weeks at school. How many tests will we have taken after 7 weeks?

A collector's model race car is scaled so that 1 inch on the model equals 6 1/4 feet on the actual car. If the model is 2/3 inch high, how high is the actual car?

Kevin, while calculating his tax adjustments, notes that he can make adjustments of $3,435 for contributions to his retirement plan, $3,393 for business losses, and $1,128 for business expenses.

Your car can go 310 miles on 20 gallons of gas. What is your car's gas mileage? How far could you drive on 55 gallons of gas?

Write the repeating decimal 0.268268268 ... as the ratio of two integers:

The net below is for a number cube. What are the three sums of the numbers on opposite surfaces of the cube?

Add or subtract numbers in scientific notation

Which is the value of the digit 8 in Alaska population?