Math practice for 13 year olds - page 206 of 422
Number of problems found: 8427
- Clock hands
Calculate the internal angles of a triangle whose vertices lie on the clock's 2, 6, and 11 hours. - A kite
Children have a kite on an 80m long rope, which floats above a place 25m from the place where children stand. How high is the dragon floating above the terrain? - Magnification 21383
When we increased the circle's radius by 2 cm, its area increased by 40π cm². Determine the radius of the circle before magnification. - Spherical 21373
The spoon has the shape of half a spherical surface with a radius of 50 mm. What volume of fluid does it fit when filled to the brim? - Cylinder-shaped 21363
82 hl of water per hour flows into the empty cylinder-shaped pool with a bottom diameter of 7.5 m. How high will the pool be filled if the water has flowed in for 4 hours? - Tiles
The pupils of the building school have to calculate how many roof tiles they will need to cover the roof of the house in the shape of two rectangles measuring 10 x 7.2 m. One roof tile covers a rectangular area of 22 cm x 32 cm. How many tiles will they n - Equation: 21313
Solve the equation: 5 / (x-4) - 2 / (4x-16) = - 7 - Water mixing
There are 5 liters of water at 75°C in the pot. How much water at 10°C do we have to add to the resulting temperature of 55°C? - Mother's 21233
They changed my mother's original salary to 750 euros in a 6:5 ratio. How many euros is he earning now? - Diameter 21173
The water ball has a volume of 32,500 m³. How big is its diameter? - Combinations and eggs
You have colored 4 red eggs, 3 green, 4 yellow, 5 blue, and 5 white. A caroler stops by you, and you decide to give him three eggs of different colors. How many options (different color combinations) do you have for gifting a caroler? - The shooter
The shooter heard the bullet's impact on the target one second after the shot. The bullet was moving at an average speed of 500 m/s. Calculate with the speed of sound of 340 m/s. Determine the distance of the target. - Base of an isosceles triangle
Calculate the size of the base of an isosceles triangle; the height is 5 cm, and the arm's length is 6.5 cm. What is the perimeter of this triangle? - A bucket
A bucket has 4 liters of water when it is 2/5 full. How much can it hold? - Identical line
In which triangles is the line identical with the height? - Contributed 20953 Three friends submitted a lotto for €600. Karel gave €250, Laco €200, and Josef gave the rest. They won €15,000 and shared the winnings in the same proportion as they contributed to the sport. How many euros did Josef receive?
- Sweets, candy
Grandfather gave out sweets to four children. At the last moment, two more children came, so to have them all the same, each of the four children would receive four candies less than they would have received if they had not. How much did my grandfather ha - Hectares of forest
Twelve workers plant 24 ha of forest in 6 days. How many days will 15 people and 12 people plant in the same area? - Sick colleague
All the classrooms at school were painted during the holidays. On the first day, 6 painters did one sixth of the required work. From the second day until the painting was finished, only 5 painters worked because one of them got sick. All the painters work - Anniversary 20843
Mr. and Mrs. Novák announce the celebration of their 190th anniversary - that's how many years they've been together this year. How old are Mr. Novák and Mr. Novák if we know that Mr. Novák is nine years older than Mrs. Novák?
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