Maths practice for 12-year-olds - page 288 of 348
Number of problems found: 6960
- Tributaries 3458
At the swimming pool, they usually use three tributaries with the same power to fill the pool. Then the pool will fill in 5 hours. How many hours less would it take to fill the pool if they added 2 more inlets with the same capacity? - Connected 3457
There are eight places in Budan, some of which are connected by roads. There is a gate at every point where the road leaves or enters the city. No two paths intersect or enter through the same entrance. The number of gates matches one of the numbers 5,15, - Identical 3452
Two identical cars use 12 l of petrol to cover 150 km. How much gasoline do 25 similar cars use per 1800 km? - Cooking on LPG
The gas bomb lasts 30 weekends for 2 hours of daily cooking. How many days will we be able to cook if we cook for 3 hours a day? - Many 3449
I eat four cows in 5 days and 16 bags of hay. How many bags will five cows eat in 5 days? - Chocolates 3448
If we pay 1.40 euros for two chocolates, how much will we pay for five chocolates? - Average 3447
The width of the well with the masonry should be 1.8 m. How much will digging a well 16 m deep be paid if an average of 800 CZK is paid from meter cubic? - Shelter 3446
The shelter buys a supply of food for 12 dogs for one week. How many days will this supply last if two more dogs are added to the shelter? - Five pumps
Three same pumps fill the tank with 50400 liters of diesel in 7 hours. How many liters of diesel will it take in 4 hours if we add two more of the same pumps and pump them the same way? How much more (or less) will they get if we add 2 of the same pumps a - Painted 3436
Mother and Pete painted a fence around the whole garden in 9 days. If Vlado helped them, how many days would it take them? - Cleaning 3434
During spring cleaning, the removal of scrap iron by truck would take 15 hours. With one tractor, it would take three times as long. In how many hours will the scrap iron be removed if the removal is carried out by a truck and two equally powerful tractor - Aquarium 3432
The aquarium has the shape of a block with a length of 0.7 m and a width of 25 cm. It can hold 56 liters of water. How deep is the aquarium? - Apples 3424
57 kg of 3q red apples is dried. How many dried apples do we get from 60 kg of fresh apples? - Quarter 3421
Lukáš was saving for new roller skates. The first month he saved a third of their price, the second month a quarter, the third month half of the rest of the price, and the fourth month €25. How much € did the skates cost? - Ninety-six 3420
Ninety-six soldiers will build a pontoon bridge in 5 hours. How long before the same bridge creates 54 soldiers? - Popsicles 3419
Karel could buy 25 popsicles for 0.69 euros for the money saved. How many comics could you buy with this money if one costs 2.62 euros? - Correctness 3416
Calculate and verify the correctness of the test result: 12 (3c - 5) + 11 = 10 (8c - 7) - 16c - Rectangle from string
String 12m. Make a rectangle when one side is two times longer than its width. - Cube walls
The wall of the cube has an area of 8 cm square. How many square cm is the surface of the cube? - Diameter 3413
The farm provided around 150 fruit trees with a trunk diameter of 2 dm with mesh to protect them from wild animals. The mesh was placed so that it was 9 cm away from the trunk. How many regular meters of mesh were needed?
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