Math practice for 13 year olds - page 174 of 428
Number of problems found: 8555
- Sidewalk worker
Workers are building a new sidewalk while revitalizing the housing estate. Six workers will do the work in 12 days, but this is a problem because the sidewalk must be completed in 10 days to complete the work on time. How many workers must be hired to com - Avia car
Avia left Prague at 7:00 a.m. at 80 km/h. When she was near Trnava (60 km from Bratislava), a Volkswagen Passat set off on the same road from Bratislava at a speed of 120 km/h. When and at what distance from Trnava did the Volkswagen Avia catch up? - The resistance
What is the resistance of an aluminum wire, 0.2 km long and 10 mm in diameter? - The caravans
At 6:00 in the morning, a caravan set out of the oasis at a speed of 1.5 miles per hour. Two hours later, a second caravan followed her at 2.5 miles per hour. When did the faster caravan run slower? How far from the oasis? - Square circle area
A circle describes a square with a side of 8 cm. Calculate the area of the rest of the circle if we cut out the square. - Class student
N boys go to class. There are 13 more girls. Today, 4 girls and 5 boys are missing. Thus, how many students in this class are in school today? - Slices of ham
If 17 slices equal 70 calories, how many calories are in 5 slices? - Savings spending
Alena and Bára had 1,500 CZK saved together at the end of January. After Alena spent CZK 318 from her savings and Bára spent CZK 249 from her savings in February, Alena had twice as much CZK saved as Bára. How much money did they have at the beginning? - Body diagonal
Calculate the length of the body diagonal of a block with dimensions: a = 20 cm, b = 30 cm, c = 15 cm. - Triangle line
In the triangle ABC, the line tb = | is given BB1 | Calculate the length of this line if B1T | = 3cm. - Two companies
Company A can fulfill the order in 12 days, and company B can fulfill the same order in 18 days. If only company A works on the order for the first two days and then both companies work on it for the remaining days, how many days will the order be fulfill - Car distance Two opposite cars passed on the way and continued. One car drove 17.5 m in 1 second and the other 15.25 m. How far will these cars be in half an hour?
- Trees
Two-fifths of the trees in the orchard are apple trees, one-sixth a pear. The remaining 26 trees are cherries. How many pears are in the orchard? - Karolína
Carolina chose five bodies from the kit - white, blue, and gray cubes, a blue cylinder, and a white triangular prism. How many different roof towers can be built one by one if all the blue bodies (cube and cylinder) are not placed on top? - Aluminum plate forces
An aluminum plate with a volume of 200 cm³ sinks in water. Determine the gravitational force exerted by the Earth on the plate. Determine the buoyant force that acts on a plate immersed in water. Compare the magnitudes of these forces and justify whether - Barrel water
The cylindrical barrel is 1.2 m high, and the diameter of its base is 0.6 m. How many hectoliters of water will fit in the barrel? What is the smallest amount of sheet metal needed for its production? (we count both bases) - The soup pot
The soup pot is shaped like a cylinder with a bottom diameter of 30 cm and a height of 36 cm. How many people is the soup enough if the pot is filled to ¾ height? It is calculated with 0.25 l of soup for one person. - Right isosceles triangle
What can be the area of a right isosceles triangle with a side length of 8 cm? - Earning 2
Rahul earns 5000 Rs, and he saves 500 Rs. What percentage of his earnings does he save? - Headphones
Charlie is saving money to buy a pair of headphones for $225. He has $37 so far and can save $15 per week. In how many weeks will he have enough money to buy the headphones?
Do you have homework that you need help solving? Ask a question, and we will try to solve it. Solving math problems.
