Maths practice for 12-year-olds - page 338 of 354
Number of problems found: 7075
- Scale
The student drew the cylinder in scale 7:1. How many times is the volume of the cylinder smaller in reality? - Bureaucracy
33 people attended the office. 9 of them completed the questionnaire. What is the percentage of all people? - Pool coating
How many tiles 20 cm × 15 cm need to coat the bottom and sidewalls of the pool with bottom dimensions 75 m × 10 m if the pool can fit up to 1402500 liters of water? - Motor physics
A car is traveling at 104 km/h on the highway. The pulling power of the motor is 10 kN. Find the engine power in kW. - Ratio
Unfold number 3690 in the ratio 15:11:4. - Parquet floor
Three workers laid the parquet floor for 2.301 hour. The first would do this work alone 7 hours, the second in 6 hours. For how many hours would this work for the third worker if he worked alone? - Inflow - outflow
The tank will fill by inflow for 56 minutes and empties by outflow for 77 minutes. How long does it take to fill the tank if it is open to inflow and outflow? - OPT
What is the perimeter of a right triangle with the legs 11 cm and 24 cm long? - Air
The room is 35.6 m long, 19.6 dm wide, and 591 cm high. How many people can simultaneously be in this room if, for hygiene reasons, is calculated 5000 dm³ of air per person? - Triangle radians
The size of two internal angles of a triangle ABC is α=6/18π and β=7/18π. Calculate the size of the third angle. - Metallurgical enterprise
Metallurgical company daily produces 501 tons of cast iron. How many tons of coke does it burn to melt cast iron when 14 tons of cast consumes 10 tons of coke? - Accidents
The count of accidents in 1991 caused 8444 women, which is 9%. How many men caused the accidents? - Lie/do not lie
The rule f(x) = -x-10 gives the function. Find whether point C[5; -15] lies on this function. Solve graphically or numerically and give reasons for your answer. - Simple interest
Peter put into bank 853 euros deposit. After 7 years on account, overall was 984 euro. What was the interest rate if the bank added simple interest? - Coffee
The coffee from the machine costs 31 cents per cup. Coffee is 20 cents more expensive than the cup. How much is the cup? - The pot
The pot is in 1/3 filled with water. The bottom of the pot has an area of 329 cm². How many centimeters rise in water level in the pot after adding 1.2 liters of water? - Word problem
348 students were on holiday in Hungary. 133 bought pizza, chips 28 pupils, 25 pupils bought soda, butter 26 pupils, 15 pupils fruits, vegetables 29 students. How much pay for all the food, if every meal costs 5.3 euros? - 7 triangle
The triangle area is 86.7 cm². find the side length if appropriate height h = 36.15 cm. - Diplomas
Zuzaně helped write out diplomas. Issuance first took 3.3 minutes, each next 2.3 minutes. How much time will it take to write out n=7 diplomas (including the first) at this pace? - Column
The vertical pole high 7 m tall broke, and its toe fell 4.7 m from the bottom of the pole. At what height above the ground does the pole break?
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