Maths practice for 12-year-olds - page 283 of 347
Number of problems found: 6923
- Tree height
A tree with an unknown height casts a shadow 18 m long at a time, while a two-meter pole casts a shadow of 2.4 m. How tall is the tree? - Seawater salt
By evaporating 15 kg of seawater, we get 517.5 g of salt. How much seawater do we need to obtain 3.45 kg of salt? - Pool filling
The swimming pool is filled with four inflow pipes in 9 hours. If one tributary is broken, how long will it be filled? - Loom weaving
The master calculated that six looms would weave the ordered fabric in 15 hours. One condition appeared. How long before the ordered substance matches the remaining states? - Hay supply
Hay stock is enough for four horses for 60 days. How long would this supply last for ten horses? - Biscuit icing
There are 200 biscuits in the box. Chocolate and sugar icing were used to decorate them. Chocolate was used on 157 biscuits and sugar on 100 biscuits. How many biscuits had both toppings? - PIN attempts
How many attempts do I need to guess the 3-digit PIN to be sure I can guess it? - Cost reduction
Windbreaker cost after discounted SKK 1275, which was 3/4 of the original price. How many SKK originally cost windbreaker? How many SKK was the cost reduced? - Pool inlets
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? - City gates
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, - Petrol consumption
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? - Cow hay
I eat four cows in 5 days and 16 bags of hay. How many bags will five cows eat in 5 days? - Chocolate cost
If we pay 1.40 euros for two chocolates, how much will we pay for five chocolates? - Well digging cost
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? - Dog food
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 - Fence painting
Mother and Peter can paint the fence around the whole garden in 9 days. If Victor helped them, how many days would it take? - Aquarium depth
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? - Dried apples
57 kg of 3q red apples is dried. How many dried apples do we get from 60 kg of fresh apples?
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