Maths practice for 12-year-olds - page 279 of 347
Number of problems found: 6923
- The creek
Workers cleaned the creek within three days. On the first day, cleanse one-fifth of the creek's length; the next day, 40% of the stream's length; and on the third day, 8 km length of the creek. How long is a creek? - Minute
Two boys started from one place. The first went north at a velocity of 3 m/s, and the second to the east with a velocity of 4 m/s. How far apart are they after a minute? - Two-digit number
I am a two-digit number less than 20. When you divide me by three, you get a remainder of 1. When you divide me by four, you also get a remainder of 1. What number am I? - Interst on savings
The bank offers 1.6% interest. How many euros do we have to insert at the beginning if we receive € 15 on the interest? - The deposit
A deposit of € 2,612.5 was placed for one year at an annual rate of 4.5%. After one year, the amount rose to € 2,612.5. Find the initial deposit. - Triangle ABC
Construct a triangle ABC is given c = 60 mm, hc = 40 mm and b = 48 mm analysis procedure steps construction - Potatoes
When planting potatoes, 3 500 kg of seeds are consumed per 1 ha. Calculate the seed weight needed for planting a square area with a side length of 325 meters. - Factory
In the factory, workers work in three shifts. Half of all employees work on the first shift, a third on the second shift, and on the third shift 200 employees. How many employees work at the factory? - Fe vs. H2O
For the same weight, which body has a greater volume: iron or water? - Sum of three numbers
The sum of three numbers from which the second number is 20% smaller than the first number and the third number is 25% smaller than the second number is 96. Determine these numbers. - UN 1 If we add one quarter of an unknown number to itself, we get 210. Find the unknown number.
- Waste paper
Our school attends 1,300 pupils. Each pupil collected plastic bottles or paper. Plastic bottles have collected 930 pupils and 600 pupils' old paper. How many students have collected plastic bottles and waste paper together? - Good swimmer
A good swimmer swims 23 m distance with ten shots. How many shots does he swim to an island located at 81 m if he still swims at the same speed? - 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 the pressures exposed to a 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 meters in water. - Contract
Eight employees complete the contract for 65 hours. After 17 hours, three employees had to leave for another job. How many more hours will it take to complete the contract? - Shaft drainage time
The mine foreman calculated that 2 pumps must be in operation for 17.5 hours to drain the shaft. 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. - Pin weight
Fifty pins with the same weight weigh 4.6 grams. How much do 15 pins weigh? - Rhumbline
Find the circumference and area of the rhumbline ABCD if the short side AD has a length of 5 cm, and the heel of the height from D leading to the AB side divides the AB side into two sections of 3 cm and 4 cm. - Catching up time
Johnny left home at 8 a.m. on foot at an average speed of 4 km/h. At 11 a.m., dad followed him on a bicycle at an average speed of 40 km/h. How long and at what distance from home will dad catch up with Johnny?
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