Maths practice for 14 year olds - page 259 of 382

Number of problems found: 7625

In and out
The empty tank is filled in 12 minutes and empty in 16 minutes. If we forget to close the drain, how long does it take to fill? The tank has 1000 liters of volume.
Locker Code Possibilities
Peter forgot the four-digit code to his school locker lock. Fortunately, his mother remembered some information about him. He knows that the first binary number is divisible by 15 and the second by 7. However, Peter is a big loser, so he has to try all th
Two forces
The two forces, F1 = 580 N and F2 = 630 N, have an angle of 59 degrees. Calculate their resultant force, F.
Library visitors
Sixty percent of library visitors borrow detective stories or science fiction and nothing else, one-fifth only classic literature and one-tenth only non-fiction. Other library visitors only borrow poetry. In September, 168 library visitors borrowed classi
Grain sowing area
According to the sowing plan, sugar beet and grain are to be sown on an area of 840 ha. The area sown with sugar beet should be three times larger than the area sown with grain. What area should the grain be on?
Plane Chase Time
A Boeing plane took off from the airport and flew at a speed of 900 km/h. When it had flown 600 km, a fighter plane was sent after it from the same airport, which flew at a speed of 2100 km/h. Calculate how long it took him to catch up.
Banana distribution
The children disassembled 48 bananas on the trip. Some children took 1 banana each, 6 children took 2 bananas each, and last, Anina was the only one who did not take even 1 banana. How many children were on the trip?
Rectangle measurements
In the ABCD rectangle, the AB side is 16 cm long, and the AC diagonal is 20 cm long. Calculate the perimeter and area of the rectangle.
Right Triangle Perimeter
The side lengths of two triangles, sorted by size, are: 8 cm, 10 cm, 13 cm, 15 cm, 17 cm, and 19 cm. One of these two triangles is right-angled. Calculate the perimeter of this right triangle in centimeters
Tea mixture
Of the two sorts of tea for 180 CZK/kg and 240 CZK/kg, we make a mixture of 12 kg that we should prepare for 200 CZK / kg. How many kilos of each sort of tea will we need to be mixed?
Tractors
Two tractors plow the field for 4 hours together. If the first tractor plowed half of the field and then the second tractor completed the job, it would take 9 hours. How many hours does the field plow for each tractor separately?
Pyramid Surface Area
The pyramid has a rectangular base with dimensions a = 5 cm, b = 6 cm. The side edges are identical; their length is h = 11 cm. Calculate the surface of the pyramid.
Paper Collection Weight
Kamil and Kamila brought a total of 140 kg of paper. Kamila weighed 30 kilograms less than Kamil. How much Kamil brought, and how much was Kamila?
Tv screen
The length of its diagonal gives the size of a tv screen. If the dimension of a tv screen is 16 inches by 14 inches, what is the TV screen size?
Cone measurements
Calculate the volume and surface of the rotating cone with the base radius r = 4.6 dm and the height v = 230 mm.
Notebook Price Increase
The notebook cost 10.50 euros after an increase of 40%. How many euros would it cost if it increased by only 20%?
Probability of Not Winning
There are 200 tickets in the raffle with one main prize. Miško bought 25 tickets. What is the probability that Miško will not win the main prize?
Probability - Number Less Six
There are 1 to 20 start numbers in the draw. What is the probability that the first downhill racer drawn will have a start number less than 6?
Arrowroot - vitamins
Ten grams of kiwi contains the same amount of vitamin C as 50 grams of oranges. One hundred grams of arrowroot contains the same amount of vitamin C as 200 grams of kiwi. How many grams of oranges contain the same amount of vitamin C as 50 grams of arrows
Tetrahedron
What is the angle of the sides from the base of a three-sided pyramid where the sides are identical?

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