Maths practice for 14 year olds - page 117 of 370

Number of problems found: 7400

Oscillations 48711
The time signal in the radio consists of four sound marks with a frequency of 1,000 Hz, of which the first three have a duration of 100 ms and the fourth 500 ms. How many oscillations will occur at each mark?
Isosceles trapezoid
Find the height in an isosceles trapezoid if the area is 520 cm² and the base a = 25 cm and c = 14 cm. Calculate the interior angles of the trapezoid.
Feed to hay
How many tons of water do we have to dehydrate from 8 tons of feed if the original moisture is 54 percent to get hay with a moisture content of 15 percent? Round to two decimal places.
Length of the chord
Calculate the length of the chord in a circle with a radius of 25 cm and a central angle of 26°.
A rectangle 5
A rectangle has sides of 10 cm and 14 cm. Calculate the angle between a diagonal and a long side.
The conical roof
The conical roof above the warehouse has a diameter of the lower part (base) d = 11.2 m and a height v = 3.3 m. How many rectangular steel plates with dimensions of 1.4 m and 0.9 m were needed to produce this roof if the seams and waste required an increa
Percentage 48523
The dairy produced 2,800 pieces of yogurt instead of 2000. By what percentage did it exceed the plan?
Students 48473
There are 30 students in the class. 70% of them have one sibling. How many students have one sibling?
Repair 48463
Car repair costs CZK 8,400. The owner paid 36% for the work and gave the rest for new parts. How much did he give for new parts?
Subsequently 48453
The book was increased by CZK 20% from CZK 350. The bookseller subsequently reduced it by 15% as it did not go on sale. What was its final price?
School 48403
There were 43 pupils in the school club, seven fewer boys than the girls. How many boys and girls were in the club?
School model
The beech school model of a regular quadrilateral pyramid has a base 20 cm long and 24 cm high. Calculate a) the surface of the pyramid in square decimeters, b) the mass of the pyramid in kilograms if the density of the beech is ρ = 0,8 g/cm³
Parallelogram ABCD
We have the parallelogram ABCD, where AB is 6.2 cm; BC is 5.4 cm and AC is 4.8 cm. Calculate the height on the AB side and the angle DAB.
Different 48243
He has four types of pants. How many T-shirts does he have if he can dress 40 different ways?
The rectangular
The rectangular trapezoid has bases 15 dm and 8 dm long, and the length of the inclined arm is 12 dm. How long is the other arm of the trapezoid?
Percentage 48223
The safe is 100 cm high, 80 cm wide, and 60 cm deep. Its internal space has a volume of 168 liters. What percentage of the total volume of the safe is occupied by the walls of the safe?
Dimensions 48161
A block with dimensions a = 15cm b = 5cm and a block height c = 8cm. Calculate the length of the wall diagonal in the base.
Calculate 48073
Calculate the area of the isosceles trapezoid ABCD if a = 14 cm, c = 8 cm, and the size of the angle DAB is 52 °.
The triangle
The triangle has sides 5 cm long, 5 cm, and 8 cm long. What is the area of the triangle?
Bracelet 48003
Radka wants to model a round bracelet with a diameter of 8 cm from copper wire. About how much wire does he need to make it if he needs to add 15% of its length to the eyelets? (π = 3.14)

Do you have unsolved math question and you need help? Ask a question, and we will try to solve it. We solve math question.