Maths practice for 12-year-olds - page 240 of 351

Number of problems found: 7020

Saleswoman 6265
They print 1,300 copies at the copy center. One copy costs 10 cents. The cost of printing one copy is 3 cents. The saleswoman receives €25 per day. How much does a copy center make per day?
Dimensions 6263
The closed petrol tank is a cuboid with dimensions of 80cm, 30cm, and 20cm. The petrol level reaches 6cm below the upper edge of the tank. Determine the amount of gasoline in the tank in liters for all possible, stable positions of the tank.
Deformation 6260
The carpet is wound on a cardboard roll in the shape of a cylinder with a diameter of d=12cm and a length of l=2m. The rolled-up carpet has an outer diameter of D=38cm, and the thickness of the rug is 8mm. What area can the carpet cover after unfolding? D
Two-euro 6259
We have one-euro and two-euro coins. There are 12 two-euro and 6:2 one-euro ones. How many euros do we have together?
Multiply 6257
If we multiply the numbers of the last three pages of the book on pyramids, we get the product 23639616. How many pages does the book have if the last page's number is steam?
Exchanged 6256
Pupils exchanged pencils, erasers, and pens so that there were two pens for 15 pencils and three pencils for two erasers. How many erasers were there for one pen?
On the map
A line 1.5 cm long corresponds to a line 3 cm long on the map. What is the scale of the map?
Building
We divided 240 boards into two piles in a 5:3 ratio at the building. How many were fewer boards in the lower pile?
Andre
Andre, Thomas, and Ivan split 88 postage stamps in a 2:5:4 ratio. How much did Thomas get?
Shadow of tree
Miro stands under a tree and watches its shadow and shadow of the tree. Miro is 180 cm tall, and its shade is 1.5 m long. The tree's shadow is three times as long as Miro's shadow. How tall is the tree in meters?
Granite cube statue
What is the weight of a granite cube with an edge length of 75 cm if one m³ of granite weighs 2.7 tons?
Calculate 6244
Calculate how many dm² of sheet metal it takes to produce a box without a lid measuring 2.1dm, 3.5dm, and 0.5dm in height.
Cubes into cuboid
How many 12-centimeter cubes fit into the block (cuboid) with 6 dm, 8.4dm, and 4.8?
Three pumps
The water tank is emptied with the first pump in 6 hours and with the second pump in 2 hours. All three pumps had to be started at once to be emptied in 1 hour. How long will it take to empty the tank with only the third pump?
Dimensions 6241
The truck's body, with dimensions of 3m, 1.5m, and 0.75m, is full of Sand. If one m³ of Sand weighs 1500kg, what is its weight?
Calculate 6240
The ratio of the two natural numbers is 2:3. The smaller number in this pair is 12. Calculate the larger A number from this pair.
One-piece 6233
If we take six pieces, we will pay only for four. One piece cost 7, and my mother bought 31 pieces. How much did she pay for the purchase?
Three 43
Three brothers inherited a cash amount of 62,000 and divided it among themselves in the ratio of 5:4:1. How much more is the largest share than the smallest share?
Holešovice 6222
Martina will leave Včelná on a bicycle at 12 km/h. From Holešovice, which is 32 km from the village of Včelná, at the same moment, Eva will drive towards it at a speed of 18 km/h. How long and where will they meet?
Surface area 6
Find the surface area of a prism whose bases are right triangles with sides of length 3, 4, and 5 inches and a height of 8 inches. Include a sketch

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