Maths practice for 14 year olds - page 299 of 370

Number of problems found: 7394

Cylindrical tank
The cylindrical tank holds 600hl water and is deep 2.5 m. Calculate the diameter of the cylinder.
Regular triangular prism
Calculate the surface area of the body of a regular triangular prism when the length of its base edge is 6.5 cm, and its height is 0.2 m.
Potatoes bags
I have three bags with 21 kg of potatoes. The first bag has 5.5 kg more potatoes than the second bag, and the third has 0.5 kg more potatoes than the second bag. Determine the weight of each bag.
Machines 3358
The first machine was made for hours to watch pieces. The more powerful machine produced 32 more watches in the same period. How many watches would both machines produce together in 3 hours?
Construction 3357
ABCD rhombus construction entered: a + b = 9 cm; AC = 4.5 cm; height ha = 3.5 cm How long do sides a and b measure?
Sawmill factory
Peter works in the factory. The bus stop is 10 km from the factory. Therefore, when the bus arrives for Peter, the driver always leaves the factory and takes him to work. They arrived at the saw exactly at 8:00. Today, the bus arrived 11 minutes earlier,
Expression 3350
Calculate the value of the expression x / y if you know that (-4x + 3y) / y = 5
Probability 3349
We have natural numbers 3, 4, 6, 10, and 12. Calculate the probability that the sum of three randomly selected three different numbers is less than 20.
Above Earth
To what height must a boy be raised above the earth to see one-fifth of its surface?
Specify 3347
We have a number. If we divide its fourth power by its square, we get the number 0.25. Find this number.
Function 3345
Perform the inverse function from f: y = 4x + 5.
Football 3338
In two days, they sold 12,600 tickets for the football match. They sold 80% of what they did the next day on the first day. How many tickets were sold on the first day, and how many on the second day?
Water tank
The water tank has a cylindrical shape with a base diameter of 4.2 m and is 80 cm deep. How many minutes will it take to fill it 10 cm below the edge of the tank if water flows 2 liters per second?
Water reservoir
The reservoir shape of a cylinder has a diameter of 8 m and a height of 2.8 m. The device indicates that the reservoir contains 800 hectoliters of water. Calculate how much % of the volume is used.
Alcohol mixture
We have to produce 0.2 kg of 60% alcohol from 55% and 80% alcohol. How many of them do we use in the solution?
Produced 3333
How much 55% alcohol do we need to add to 1500 grams of 80% alcohol to produce 60% alcohol? How much is 60% of alcohol produced?
Gasoline tank cylindrical
What is the inner diameter of the tank, which is 8 m long and contains 40 cubic meters of gasoline?
Collection
John collected half a bucket of raspberries in 45 minutes, and Eva collected the whole bucket in an hour. How many minutes would it take to fill a bucket if the two children worked together?
Vacation
Karel and his parents flew on vacation. When checking in at the airport, their 3 pieces of luggage had a total weight of 44 kg. Father's luggage weighed three times as much as Karl's luggage, and mother's luggage weighed half as much as father's luggage.
CuZn
Brass is an alloy of copper and zinc. The 10-centimeter brass cube weighs 8.6 kg. Copper density is 8930 kg/m³, the zinc density is 7130 kg/m³. Calculate how many kilograms of copper and zinc a cube contains.

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