Maths practice for 12-year-olds - page 62 of 355

Number of problems found: 7090

Horse water supply
The water supply is enough for 12 horses for 16 days. How many horses will this supply of water last for 12 days?
Appliance voltage current
The voltage at the terminals of the appliance is 4.5 V. A current of 0.5A passes through the appliance. What voltage must the appliance have if a current of 0.7A is to pass through it?
Cube volume surface
The volume of a cube is 0.512 m³. Calculate its surface area.
Cube surface volume
The surface of the cube is 150 dm². Calculate its volume.
Cone volume surface
Calculate a cone's volume and surface area with base diameter d = 22 cm and body height v = 40 cm.
School hour fraction
A school hour lasts 3/4 of an hour; what part of an hour is 1/6 of a school hour?
Rectangular base - II
Calculate the volume of a pyramid with a rectangular base with sides a = 7 cm, b = 5 cm, and height of the pyramid v = 13 cm.
Forest plan section
The forest strip is 450 m long. Calculate the section length that expresses this dimension on the 1:12500 scale plan.
Pipe water radius
5 m³ of water flows through the pipe in 1 second at a maximum speed of 2 m/s. What is the pipe radius?
Number addition multiplication
If I add 5 to this number, I get the same result as multiplying it by 5. What is that number?
Sugarcane harvest yield
3.6 tons of sugarcane were harvested on the experimental plot of 0.2 ha. How many tons of sugarcane can be harvested on a plot of land of 18.6 hectares with the same yield per hectare?
Landing pad width
There is a 30 cm layer of sand in the landing area. Determine the width of the landing pad if its length is 5 m and the volume of sand in it is 2.7 m³.
Foundations dimensions
The house has foundations of 12x8m. How many cubic meters of gravel do we need if we want to fill it to a depth of 10 cm?
Resort nationality distribution
In the popular Italian resort of Caorle, there are only 4 nationalities. The resort has 3/20 Germans, 2/5 Czechs, 1/4 Austrians, and 500 Brits. How many tourists are there in total at the resort?
Afforestation workers
During afforestation, two workers planted 80 seedlings in 2 hours. At the same output, how many seedlings did 6 workers plant in 5 hours?
Cube edge volume
Calculate the edge of a cube with a volume of 150 cubic cm.
Fence paint consumption
Mr. Konečný used 0.9 kg of paint to paint an 8 m long and 1.2 m high fence. a) How many kg must he buy when he will paint a 35m long fence of the same height? b) How much paint will Mr. Malík need for a fence 1.5m high and 42m long.
Pit soil volume
The lime pit has the shape of a quadrilateral prism with dimensions of 2m, 1.8m, and 1.5m Calculate the pile volume from the excavated soil, which, due to fluffing, is 20% larger than the volume of the pit.
Passenger train
At 9:15 AM, a passenger train passes the station at a speed of 75 km/h. At 10 o'clock, an express train passes through the same station in the same direction at a speed of 120 km/h. Both trains arrive at the same destination station at the same time. a) a
Cinema seat probability
Calculate the probability of the event that you sit in seats 1 to 30 in the cinema at: a) seat marked with a prime number b) seat marked with an even number c) a seat marked with a number divisible by 3 or 4

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