Maths practice for 14 year olds - page 140 of 362
Number of problems found: 7228
- Fur coat discount
The shop with fur coats has a red fur coat that costs 150 euros, with an 85 percent discount. How much does it cost after the discount? If there was an 85% discount, how much would it cost? - Metal washers
Metal washers with a diameter of 80 mm are cut from a strip of steel sheet with a width of 10 cm and a length of 2 m. When two adjacent circles meet, calculate the material waste percentage if no material is lost. - Average weight
Mom bought six apples with an average weight of 130 g - If she took one apple out of the bag, the average weight of the remaining apples changed to 140 g. What was the weight of the removed apple? - Locomotive pressure
What is the pressure on the tracks when a 10-ton locomotive with eight wheels stands on it, and each wheel has a contact area of 4 cm²? - Arithmetic sequence filling
Fill the numbers in the place of the asterisk to form an arithmetic sequence. (2, *, 5, *, 8, 9.5,11) - Tangens parallelogram
If ∠BAD between the sides AB and AD of the parallelogram is θ, what is tan θ? See diagram: A=(7,1) B=(5,-2) C=(12,1) D=(14,4) - Wheel water depth
A pole is stuck in the water. 40 cm is in the ground, 2/3 of the length is in the water, and 1/5 of the length is above the water. How long is the pole, how many cm is in the water, and how much is above the water? - Circuit voltage
Calculate the closed-circuit voltage. Calculate the power on the resistors. R1 = 30 ohms, R2 = 10 ohms. I = 0.1 A. U =?. The resistors are connected in series, one after the other. - Mushrooms
The mushroom picker had 110 mushrooms in the basket. He had 36 mushrooms less than cossacks. How many mushrooms did he bring if he only had cossacks and mushrooms in the basket? - The nuts
There are 159 nuts in two bags, 15 more in the first than in the second. How many nuts are in the bags? - Together m+d
Aunt Jane would paint her apartment in 10 hours and her mother in 15 hours. How much do they paint it together? - Triangular prism
The regular triangular prism has a base edge of 8.6 dm and a height of 1.5 m. Find its volume and surface area. - Bulb resistance
At a certain point, we measured a voltage of 4.5 V at a current of 150 mA at the bulb's terminals connected to the electrical circuit. What is the resistance of the bulb? - Outside point
The square ABCD and the point E lying outside the given square are given. What is the area of the square when the distance | AE | = 2, | DE | = 5 a | BE | = 4? - The rotating
The rotating cone has a height of 0.9 m, and the diameter of the base is 7.2 dm. Calculate the surface of the cone. (Hint: use Pythagorean theorem for a side of cone) - The volume
The volume of a cone is 94.2 dm³ and the base radius is 6 dm. Calculate the total surface area of the cone. - Olympiad student
Sixty-two high school students took part in the Mathematical Olympiad. There were 7 fewer first-year students than sophomores, two-thirds of the number of third-year students, and 5 fourth-year students. How many students from each grade took part in the - Perpendicular legs PT
In a right triangle, one leg is 5 cm longer than the other leg. The hypotenuse is 150 mm. Calculate the lengths of the legs. - Sulfuric acid preparation
Laboratory assistant Eve is to prepare 0.5 liters of 30% sulfuric acid. It has 60% and 15% sulfuric acid ready. How many of which will he use in the solution? - The father
The father is three times older than his son. 10 years ago, a father was seven times older than his son. How old are father and son?
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