Maths practice for 14 year olds - page 185 of 362
Number of problems found: 7230
- Newtonmeters
The driver loosened the nut on the car wheel with a wrench that held 20 cm from the axis of the bolt. He acted on the key with a force of 320 N. At what moment did he act on the bolt? - Possible combinations - word
How many ways can the letters F, A, I, and R be arranged? - Conical bottle
When a conical bottle rests on its flat base, the water in the bottle is 8 cm from its vertex. When the same conical bottle is turned upside down, the water level is 2 cm from its base. What is the height of the bottle? - Two bodies
The rectangle with dimensions 8 cm and 4 cm is rotated 360º first around the longer side to form the first body. Then, we similarly rotate the rectangle around the shorter side b to form a second body. Find the ratio of surfaces of the first and second bo - Mine temperature calculation
The earth's temperature rises to a depth of about 1 °C at 33 meters. What is the approximate temperature at the bottom of a mine 1090m deep? If at a depth of 100m, the temperature is 11 °C? - Breakfast combination calculation
Anna prepares for breakfast - buckwheat or millet porridge with one of three fruits flavored with honey or cocoa. How many different types of breakfast can you prepare from the listed ingredients? - Circle radius calculation
Point B is the center of the circle. The line AC touches the circles at point C and applies AB = 20 cm and AC = 16 cm. What is the radius of the circle BC? - Diagonal intersect
Isosceles trapezoid ABCD with length bases | AB | = 6 cm, CD | = 4 cm is divided into four triangles by the diagonals intersecting at point S. How much of the area of the trapezoid are ABS and CDS triangles? - Average monthly salary
A total of 10 teachers work at one small school in Moravia. The monthly salary of each is 21,500 CZK or 21,800 CZK or 22,500 CZK, according to their education and age. The average monthly salary for this school's teacher is 21 850 CZK. How many teachers o - A cloth
There are flower cloths 495 meters, white cloth 330 meters. What is the percentage of white cloth? How much is white cloth less than flower cloth? - Heat capacity
In a clay vessel there is water with a mass of m = 0.80 kg and a temperature of t1 = 15°C. An Indian woman took from a fireplace four basalt stones, each with a mass of m2 = 0.2 kg and with a temperature of t2 = 450°C, and - Axial section of the cone
The axial section of the cone is an isosceles triangle in which the ratio of cone diameter to cone side is 2:3. Calculate its volume if you know its area is 314 cm square. - Cone side
Calculate the volume and lateral surface area of a cone with a height of 10 cm, given that the axial cross-section has an angle of 30° between the height and the slant side. - Cube surface volume
How many percent will it increase a) surface b) cube volume if the edge of the cube increases by 25%? - There
There is a stretched steel cable between the three columns. The height of the first column is 4 m, and the height of the second is 3.5 m. The distance between the first two columns is 2.5 m, and the distance between the second and third is 5 m. The heels - The Indian tent
The Indian tent is cone-shaped. Its height is 3.5 m. The diameter of the base is 2.5 m. How much canvas is needed to make a tire? - Unknown number
15% of the unknown number is 18, less than 21% of the same number. What is the unknown number? - The product
The product of a number plus that number and its inverse is two and one-half. What is the inverse of this number? - Tourist speed puzzle
If a tourist reduced his speed by 1 km/h, he would walk less than 12 km in 3 hours. If he added to the step by 1 km/h, he would walk more than 25 km in 5 hours. How fast is the tourist? - Candies in the jug
In the jug there are candies. The first taker of candy was Lukáš, who took a certain number. The second taker was Zuzka, who took twice as many candies as Jirka; at that moment there were 0 candies in the jug. How many did each of them take, if the number
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