Maths practice for 12-year-olds - page 209 of 347

Number of problems found: 6930

Dividing Money Given Ratio
The company paid three employees 50 euros, 100 euros, and 60 euros. They are to receive a total of 735 euros for further work. How will they divide this amount if it is divided in the ratio as in the first case?
Midpoint 5
FM=3x-4, MG=5x-26, FG=? Point M is the midpoint of FG. Use the given information to find the unknown measure or value.
Spruce wood
Calculate the weight of an edge made of spruce wood 6 m long when the cross-section of the edge is 146 cm square and if the density of the wood is 0.55 grams/cm cubic.
Horizontal distance
The road has a gradient of 8%. How many meters will it rise over a horizontal distance of 400 m?
Lumberjacks
Fifteen lumberjacks would take 12 days to destroy the broken trees. How many days would this work require if the company added five workers to it after four days?
Cube QR Codes Area
Peter built a cube in Ostrava, each wall with a unique QR code. The edge of the cube is 107 cm long. Calculate how large an area its author had to cover with white and black.
Calories 2
Ben eats approximately 2400 calories per day. His wife Sarah eats 5/8 as much. How many calories does Sarah eat per day?
Equivalent fractions
Are these two fractions -4/9 and 11/15 equivalent?
Flowerbeds
What is the smallest length of flowerbeds we must prepare to plant seedlings at grids of 20,30,25,40 cm?
The pot
The pot is a cylinder with a volume of V = 7 l and an inner diameter of d = 20 cm. Find its depth.
The cube
The cube has a 25 cm edge. We cut it into small cubes with 5 cm long sides. How many of these little ones are left when we build a new cube of 20 cm in length?
Number sum change
How much does the sum of three two-digit numbers change when we increase the first by 20, decrease the second by 10, and leave the third unchanged?
Circle position sketch
Sketch the relative position of the circles k1 (S1, r1 = 5 cm) and k2 (S2, r2 = 3 cm) and k / S1S2 / = 0 cm and give its name.
Money Sharing Equal Amount
Sylva and Sarah have 20 CZK together. If Sylva gives Sarah 6 CZK, they will have the same. Sylva has how many more CZK?
Five Odd Numbers Sum
The sum of five consecutive odd numbers is 35. What are these numbers?
Mixing Celsius and Fahrenheit
Add up three temperatures: 5°F +6°F +0°C
Inlet minus outlet
Water flows into the tank through two pipes and out of the third pipe spontaneously. Pipe A would fill the tank in 3 hours, pipe B would fill in 4 hours, and pipe C would flow out in 12 hours. If all three pipes open simultaneously, how long will the tank
Company layoff proportion
The company RAK employs two groups of workers: workers and administration. There are three times more workers than the administration. Half of the administration and a third of the workers will be laid off. What proportion of the company's employees will
Cube root
For 13, Sam wrote 2891 instead of the correct cube number. By how much was he wrong?
Velocipedes
In the 19th century, bicycles had no chain drive, and the wheel axis connected the pedals directly. This wheel diameter gradually increased until the so-called high bikes (velocipedes) had a front-wheel diameter of up to 1.5 meters, while the rear wheel w

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