Math practice for 13 year olds - page 147 of 435
Number of problems found: 8681
- A water tank
Tom has a water tank that holds 5 gallons of water. Tom uses water from a full tank to fill six bottles, which hold 16 ounces, and a pitcher, which holds 1/2 a gallon. How many ounces of water are left in the water tank? - Sharonsville fires
In the city of Sharonville, there were 678 structure fires in 1997. In 1999, the number of structure fires in Sharonville decreased by 26. By what percentage did structure fires decrease in Sharonville? - An architect
An architect is designing a house. He wants the bedroom to have the dimensions of 8 ft by 4 ft by 7 ft. The architect doubles all three dimensions to create the den. Does that mean the den will have double the volume of the bedroom? First, find the volume - Trigonometric 50551
Solve the trigonometric equation: cos (x-52°) = 1 - Maria 2
Maria is seven years older than her brother Robert, and in 2 years, her age will be four times Robert's age three years ago. Find their present ages. - The floor
The floor collapsed because three and a half times the amount it had been designed to hold had been stored in the room. What amount was the floor designed to hold if we had stored 980 tons in the room? - Fraction unknowns
Divide fractions with unknowns: Fraction 1: The quantity x squared plus 6 times x plus 9 over the quantity x minus 1. Fraction 2: the quantity x squared minus 9 over the quantity x squared minus 2 times x plus 1. Find Fraction 1 over Fraction 2.
- Special sequence
What if 2×9=1 3×9=2 4×9=3 5×9=4 6×9=5 7×9=6 8×9=7 9×9=8 10×9=9 then 1×9=??? Answer with solutions. - Equation with fractions
What is the simplified form of the equation fraction 4 over 5 n minus fraction 1 over 5 equals fraction 2 over 5 n? n = -2 n = 4 n = fraction 1 over 2 - Luiza
Luiza delivers newspapers in her neighborhood. If you plot the points (-1, 1), (4, 1), (4, -2), and (-1, -2), you will create a representation of the route she takes in miles. How many miles does her route cover? - Wheel gear
A drive wheel of radius two is connected to a drive wheel of radius one by a pulley of length 17. What is the distance between the wheel axles? - Luana
Luana is making a recipe that uses 2 7/8 cups of sugar. She has 1 1/4 cups sugar in her sugar bowl and 7 1/2 cups in the canister. How many cups of sugar will Luana have left after she makes her recipe? - Duval
Duval went to bat 80 times during a baseball season. In the first half of the season, he had 15 hits. In the second half of the season, he had nine hits. Which percent of the time did Duval get a hit during the entire season? - Cost and profit
Find the cost price of an article that was sold for 90.00 at a profit of 20 percent. - Water overflow
A rectangular container has a length of 30 cm, a width of 20 cm, and a height of 24 cm. It is filled with water to a depth of 15 cm. Some water overflows when an additional 6.5 liters of water is poured into the container. How many liters of water overflo
- An online
An online retailer offers a selection of electronic books for $4 each, plus a fixed download charge of $1 for any number of books. Write an equation to represent the total cost in dollars c for b books. - Car rent 2
The cost (c), in dollars, charged by a car rental agency is calculated using the equation c = 12 +0.29m, where m represents the distance traveled in miles. Calculate the distance traveled for the cost of $56. 37. - Rectangular 50093
The forestry plant plants new trees on a rectangular area 1.8 km long and 880 m wide. In the first week, they planted 3/11 of the total area. In the second week, they had 4/9 of the total area. How many hectares are left to plant? - There 11
There are 50 pupils in the class. Out of this number, 1/10 speak French only, and 4/5 of the ten speak French and English. If the rest speak English only, find the number of students who speak only English. - Chad buys
Chad buys peanuts in 2-pound bags. He repackages them into bags that hold 5/6 pounds of peanuts. How many 2-pound bags of peanuts should Chad buy to fill the 5/6-pound bags without having any peanuts left over?
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