Answer this question:Pria bought a new car that advertised an estimated gas mileage of 35 miles per gallon. The car has a 12-gallon tank. She filled her car full of gas and was able to drive a total of 372 miles. What was the difference, in miles per gallon, between Pria's mileage and the advertised mileage?
Pria's car achieved a rate of 372 miles / 12 gallons = 31 miles per gallon. Therefore, it was a difference of 35 - 31 = 4 miles per gallon.
The answer is 4.

Answer this question:Tobias is a tractor salesman. His salary is based on the number of tractors he sells. For every red tractor he sells, he gets paid 10% of the sales price for each tractor. For every green tractor he sells, he gets paid 20% of the sales price for each tractor. This week, he sold 2 red tractors and 3 green tractors. The price of a single red tractor is $20,000. This week, Tobias's salary was $7000. What is the full price of a single green tractor, in dollars?
For red tractors, 10% of the sales price is 10 / 100 * $20,000 = $2000. By selling two red tractors, he earned 2 * $2000 = $4000. Thus, of the $7000 salary he was paid this week, $7000 - $4000 = $3000 is from sales of green tractors. And since he sold three green tractors, the commission for the sale of a single green tractor is $3000 / 3 = $1000,. If $1000 is 20% of the full price, then the full price for a green tractor is (100 / 20) * $1000 = $5000.
The answer is 5000.

Answer this question:Joe sells cookies for 20% more than it costs to make them. If he sold 50 cookies and earned $60, how much do the cookies cost to make?
He sold the cookies for $1.20 each because 60 / 50 = 1.2. They cost $1 to make because 1.2 / 1.2 = 1.
The answer is 1.

Answer this question:Jennifer is building tanks to hold her goldfish. She built 3 tanks that will hold 15 fish each, heated, and filled them. She plans to build the rest of the tanks equipped with heaters, and they will hold 10 fish each. If she needs to build enough tanks to house a total of 75 fish, how many more will she need to build?
With the tanks already built it has room for 3 tanks * 15 fish / tank = 45 fish. The total of fish that still lack space is 75 fish - 45 fish = 30 fish. This means Jennifer needs 30 fish / 10 fish / tank = 3 tanks of 10 fish.
The answer is 3.