Maths practice for 12-year-olds - page 286 of 347
Number of problems found: 6923
- Average speed
If a train travels at an average speed of 60 km/h, it covers a certain distance in 5 hours and 30 minutes. What average speed would be needed to cover the same distance in 5 hours? - The chef
The chef has to prepare 60 hundred-gram portions of roasted pork. Since 1 kg of raw meat loses 150 grams by baking, how many kilograms of meat does he have to start roasting? - Triangle sides
The perimeter of the isosceles triangle is 32 cm. The base is 2 cm longer than the shoulder. Calculate the sides of the triangle. - Workers needed
The broad workers will do the job in 22.5 days. How many workers still need to be hired to do the job seven days earlier? - Tile colors
The rectangle 1 m and 40 cm long and 1 m and 20 cm wide is paved with square tiles with a side of 1 dm. There is one row of brown tiles on all edges of the rectangle, white on the inside. How many brown and how many white tiles? - Pullover price
The pullover originally cost 45 euros. First, it fell by 20% and then by 10%. What is its current price? - Candies
The price for 1 kg of more expensive candies is 125 CZK. The price for 1 kg of cheaper candy is 100 CZK. We mix two different mixtures of candy. A) The first mixture contains 2 kg more expensive and 0.5 kg cheaper candy. Calculate the price for 1 kg of th - Rowing adolescents
The rowing club has 90 members. Four times as many older adolescents are in the section as younger adolescents. On the other hand, 54 fewer younger adolescents are in the section than older adolescents. How many older and younger adolescents are there? - Magic number
The number 135 split into two addends so that one addend was 30 greater than 2/5 the addend. - Floor cleaning
Nine cleaners clean 3150 m² of the floor in 7 days. Determine how many m² of floor eight cleaners will clean in 9 days. - Unknown number
Find the unknown number equal to a quarter of a fifth of a number, which is 152 more than an unknown number. - Quadrilateral construction
Construct a quadrilateral ABCD with dimensions AB, BC, AC, BD, and angle d = CDA. - Engine pulley
The engine has a 1460 rev/min (RPM). The disc diameter is 350 mm. What will be the peripheral disc speed in RPM? Pulleys on the engine have a diameter of 80 mm, and a disc has a diameter of 160 mm. - Butterfly flight distance
The death's-head hawkmoth flies at a speed of 50 km/h. They will move to us from Africa in 3 and 3/4 days. How many kilometers will it fly on this journey? - Cylinder twice
If the radius of the cylinder increases twice, and the height is reduced twice, then the volume of the cylinder increases (how many times?): - Tank full
Two hl of water were poured into a block-shaped tank with dimensions of 450 mm and 600 mm and a height of 900 mm. How many liters of water need to be added to keep the tank full? - Diamond height
Calculate the height of a diamond with a circumference of 21.6 cm and an area of 21.6 cm squares. - Cities distance
The bus from Prague to M. Lázně travels at a speed of 36 km/h. At the same time, a car left Mariánské Lázně in the direction of Prague at a speed of 52 km/h. After the 90-minute journey, the two vehicles are still 30 km apart. What is the distance between - Copper plate
Calculate the thickness of the copper plate with a density of 8.7 g/cm³ measuring 1.5 meters and 80 cm, and its weight is 3.65 kg. - Blueberries
Adéla sells blueberries for 50 CZK/1 l, and Zdeněk sells 1 kg of blueberries for 75 CZK. Which of them sells irritants if 1 liter of blueberries weighs 650 g?
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