Math practice for 13 year olds - page 189 of 428

Number of problems found: 8555

Tea mixture calculation
From two types of tea for 160 CZK per 1 kg and 220 CZK per kilogram, 20 kilograms of the mixture for 205 CZK per kilogram will be prepared. How many kilograms of each type of tea need to be mixed?
The bulb
ON the bulb we a reading of 6V and 0.05 A. What current flows through the bulb if we connect it to a cell with a voltage of 12V?
Stove voltage drop
A stove with a current of 4.0A is connected to the 220V voltage. The current has been reduced to 2.4A due to a fault in the network. How much has the voltage in the socket dropped?
Isosceles triangle
Calculate the area of an isosceles triangle, the base measuring 16 cm and the arms 10 cm.
Quadrilateral prism
The height of a regular quadrilateral prism is v = 10 cm, and the deviation of the body diagonal from the base is 60°. Determine the length of the base edges, the surface, and the prism's volume.
Study results
Seven students in the class have excellent results, six praiseworthy, five good, four sufficient, and three insufficient students. What is the probability that it will be a good student when summoned?
Ace or king
What is the probability that we will choose an ace or a king when choosing from a deck of sevens cards?
Three ships
There are three ships moored in the port, which sail together. The first ship returns after two weeks, the second after four weeks, and the third after eight weeks. In how many weeks will the ships meet in the port for the first time? How many times have
Barrel diameter calculation
The barrel holds two hectoliters of water and reaches a height of 125cm. Calculate the inside diameter of the barrel.
Surface of the cone
Calculate the cone's surface if its height is 8 cm and the volume is 301.44 cm³.
Volume of the cone
Calculate the cone's volume if its base area is 78.5 cm² and the shell area is 219.8 cm².
Calculate
Calculate the cone's surface and volume from the rotation of the right triangle ABC with the squares 6 cm and 9 cm long around the shorter squeegee.
Cone - from volume surface area
The volume of the rotating cone is 1,018.87 dm³, and its height is 120 cm. What is the surface area of the cone?
Rotating cone
If the side of the rotating cone is 150 mm long and the circumference of the base is 43.96 cm, find its surface and volume.
Calculate the cone
The volume of the cone is 461.58 cm³. Its diameter is 14 cm. Calculate the surface area of this cone.
Cone - side
If the cone's height is 125 mm and its side length is 17 cm, find its surface area and volume.
Cone surface volume
Calculate the cone's surface and volume if its base diameter is 1 dm and the side length is 13 cm.
Cone surface volume
Calculate the cone's surface and volume if its base diameter is 12 cm and the height is 150 mm.
Gutter metal calculation
Gutters have the shape of a half-cylinder. Their diameter is 20 cm, and the total length around the roof is 35 m. How much is sheet metal needed to make them? Add 15% to the connections.
There 3
There are six bays at an oil change shop. It takes 45 minutes to work on a car at each bay. Cars are coming every 6 minutes to the shop for an oil change. How long before cars start backing up? What kind of spacing is needed to maintain proper flow?

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