Maths practice for 12-year-olds - page 248 of 351

Number of problems found: 7018

Together
Grandfather, father, and son are carpenters. They decided to make a wardrobe. Father produces it for 12 hours, his son for 15 hours, and grandfather for 10 hours. How long will they make it together?
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.
Cyclists 5827
Cyclists ran 3/7 of the total length during the race and had 80.5 km to finish. How long is the race?
Orchard
Three-fifths of the orchard are apple trees, and one-third of the trees are cherries. The remaining five trees are pears. How many trees are in the orchard?
Watering 5813
The garden hose flows 21 1/2 liters of water in one minute. How many liters of water are used for water in 8 1/2 minutes?
Milk
At the kindergarten, every child got 1/5 liter of milk in the morning and another 1/8 liter of milk in the afternoon. How many liters were consumed per day by 20 children?
Proportion 5811
In what proportion do we need to increase the length of the picture frame if its original length is 55 cm and 30 cm larger?
Traveling 5808
The diameter of the wheel is 56cm. How often does it turn in 5 minutes if traveling at 60km/h?
Railroad
The railroad runs parallel to the railway. The train travels at 36 km/h on track. In the opposite direction, the motorcycle rides at 90 km/h. The train passes in 3 seconds. How long is a train?
Three-fifths 5801
Anka bought one whole 5 liters of mineral water for trip one and drank three-fifths of it. How many liters of mineral water are left?
Natural gas in kWh
Gas consumption for 2017 was 11,301 kWh I paid 532 € How much is 1 m³?
Installed 5793
A group of fitters installed the cable line in 9 changes, and the second group completed the same task in 1/3 less time. How many shifts would the third group do the same work if, with all three groups working together, the assembly took 2 shifts?
How many
How many double-digit numbers greater than 30 can we create from digits 0, 1, 2, 3, 4, and 5? We cannot repeat numbers in a two-digit number.
Trees
The total number of trees in the orchard is two-fifths of pearls and apples are three eighty. The rest of the trees are nine ceremonial. How many trees are in the set?
Three-quarters 5783
A crane loads goods onto the wagons of a freight train. Goods of the first type weigh two and three-quarter tons, goods of the second type two and a quarter tons, goods of the third type one and a half tons, goods of the fourth type three-quarters of a to
Performances 5782
A group of three girls won a € 30 science competition. Kamila, Magda, and Zuzka divided the win according to their performances in the ratio of 3:4:5. How many euros have each of them?
Percentage 5780
What percentage of 1m is 15cm?
Numbers 5777
Which number is also on the number axis from numbers 299 and 1051?
Distance 5773
The air distance from the hotel to the castle is 4.4 km. What is the map's scale on which this distance is shown by a line 4 cm long?
Garden
The rectangular garden has dimensions of 27 m and 30 m. Peter and Katka split it in a ratio of 4:5. How many square meters did Katkin measure part of the garden?

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