Maths practice for 12-year-olds - page 321 of 347
Number of problems found: 6932
- Water
The lawn has an area 1571 m², rained 5 mm of water. How many liters of water rained? - Medians in triangle
The median of the isosceles triangle is 3 cm long. If its perimeter is 16 cm, determine the size of its sides. - Lunch
Jane eats the whole lunch for 30 minutes. Which part of the lunch does he eat in 180 seconds? - Step length
Katy, whose step measures 50 cm, counted 294 steps from her house to her aunt's. If his step measures 70 cm, how many steps will Katy's father take to his aunt? - Feed for horses
In the kennel, have feed for two horses for 21 days. The station brought an additional five horses. How many days will feed for all the horses last if they have the same daily ratio? - Coal
The daily consumption of 1.6 tons of coal is sufficient to supply the boiler for 42 days. How long is sufficient to supply when it burns only 1.2 tons of coal a day? - Florist's
The flower shop has 72 white and 90 red roses. How many identical bouquets can they most tie together so that all the roses are used? - Tailor master
There are less than 50 m of textile in the tailoring workshop. No textile is left when cutting on a blouse (consumption 1.5 m). No textile is left when using a cloth (consumption of 3.2 m). How many meters of textiles are in a tailor's workshop? - Painting
Joseph and Frank painted the bench for four hours. If four friends helped him, how many hours would it take him to work? - Mukls
The six workers' working group would order jobs completed within 21 working days. How many workers must be added to complete a contract in 14 working days? - The horses
A couple of horses consume 88 kg of oats for 14 days. How many oats were consumed by seven horses at the same consumption for six days? - Wood
Peter chops wood. If they cut down a half hour a day, he would finish work in nine days. But Peter needs to finish work three days earlier. How many minutes should they cut down a day? - Cooks
Four cooks cleaned 5 kg of potatoes for 10 minutes. How many cooks would have to work cleaning 9 kg of potatoes for 12 minutes? - Greenhouses
Two workers would complete the installation of greenhouses for 54 hours. In how many hours will nine workers? - Painting school
Redecoration school had scheduled for four crew to 10 days. After two days, a single worker was ill. For how many days was the school painted when remain workers working with the same tempo? - Five tractors
Five tractors plow the field in 4.8 hours. How long would it take to plow this field if, after 1.5 hours of work, two tractors went to a different field? - Common cylinder
I've quite a common example of a rotary cylinder. Known: S1 = 1 m2, r = 0.1 m Calculate : v =? V =? Can you verify the results? - Wood
Wood contains 12% water. One m³ of wood weighs 650 kg. How many liters of water does it contain? - Pumps
The first pump flows 16 liters per second into the basin by the second pump 75% of the first and by the third pump half more than the second. How long will it take to fill the basin with all three pumps simultaneously, a volume of 15 m³ (cubic meters)? - Family
Martin has just as brothers and sisters. But his sister Jana has two times more brothers than sisters. a) How many children are in this family? b) How many boys and how many girls are in the family?
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