Simple proportion - practice for 12 year olds - last page
Number of problems found: 140
- Sugar
From 3 tons of sugar, beet produced 480 kg of sugar. How many tons of sugar was produced from 17.5 tons of sugar beet? - Diver and pressure
Determine what pressures are exposed diver without a suit at a depth of 15 meters, with a small space suit at a depth of 25 meters and a massive suit at 70 m in water. - Calculation 3620
The mine foreman calculated that 2 pumps must be in operation for 17.5 hours to drain the tunnel. He wanted to speed up the emptying of the shaft and added 3 more identical pumps. How long will it take to empty the shaft? Please also show your calculation - Switzerland 3584
Zuzka and Hanka used to work in a cherry orchard to earn money for a sightseeing trip to Switzerland. They brushed 15 trees every day and harvested the entire orchard in 10 days. How long would it take them to harvest the entire orchard if they brushed 20
- Proportion
Write the following proportion: Eight is to 64 as to 2 is to x - Department 3500
The city plan has a scale of 1:5 0000, which determines the actual dimensions of a department store that has a length of 18 mm and a width of 25 mm. - Toothpaste 3479
A full tube of toothpaste is enough for one family member for six weeks. How long will three family members last? - Two-meter 3473
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? - Loading car
The car was loaded with 78 boxes weighing 19 kg. How many 25kg boxes can it load if the total weight is the same?
- The chef
The chef has to prepare 60 hundred-gram portions of roasted pork, and he knows that 1 kg of raw meat loses 150 grams by baking. How many kilograms of meat does he have to start roasting? - Ratios
Reduce the numbers: 50 in a 1:2 ratio 111 at a ratio of 2:3 70 at 10:50 560 at a ratio of 3:8 - Cylinder
The cylinder-shaped container has 80 liters of water. The water reaches 45 cm in height. How many water liters will be in a container if the water level extends to a height of 72 cm? Write the result in liters. Write down only as a whole or decimal number - Solve
Solve this direct relation by the triplet: 0.25h. .. . . .. .. . . .. .. .. 3 pcs 6.5h. .. . . .. .. . . .. .. . . .. .. x pcs - Water inlets
An Inlet valve with a flow rate of 12 liters per second is filled tank for 72 minutes. How long does it take to fill the full tank if we open one more such valve half an hour after?
- Glass
At the glass shop, we have to cut eight sheets of glass. Each was shaped as a square with sides of 18 cm. We paid 44 CZK. How much is 1 m² of glass? - Johnny
Johnny bought 28 CZK flowers for mum. He spent 4/7 of the money saved. How much money had he saved? How much money was left him? - New computer
The new computer process a certain amount of data for 6 hours. How many hours will process the same amount of data older computer with a quarter lower performance? - Motor oil
Thirty liters of oil cost 28.80 Euros. How much cost a liter? - Supermarket cashiers
When only two checkouts are open in a supermarket, people wait in line for an average of 12 minutes. How much will the average waiting time in line be reduced if they open three more ticket offices?
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