Math practice for 13 year olds - page 338 of 424
Number of problems found: 8462
- Ice cream
Annie likes ice cream. In the shop are six kinds of ice cream. How many ways can she buy ice cream in three scoops if each has a different flavor mound and the order of scoops doesn't matter? - Price increase 2x
If we increase the product's price twice by 20%, how much % is higher the final price than the original? - 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 the job on the contract be fulfilled? - Calculation 3620
The mine foreman calculated that 2 pumps must be in operation for 17.5 hours to drain the tunnel. 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 - Pumps
Four identical pumps fill the tank in 40 hours. How many pumps would we have to use if we wanted to save 8 hours? - 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. - Distance 3615
Honza 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 Honza? - Master work
The master will complete the given task in 4 hours. When they're done together, how long will it take to master students entirely in three hours? - Horizontal Cylindrical Segment
How much fuel is in the horizontal cylindrical segment tank with a length of 10m, a width of level 1 meter, and a level of 0.2 meters below the tank's upper side? - Tetrahedral pyramid
It is given a regular tetrahedral pyramid with a base edge of 6 cm and a height of pyramid 10 cm. Calculate the length of its side edges. - Canister
Gasoline is stored in a cuboid canister having dimensions 44.5 cm, 30 cm, and 16 cm. What is the total weight of a full canister when one cubic meter of gasoline weighs 710 kg, and the weight of an empty canister is 1.5 kg? - Daughter 3610
A mother is six times older than her daughter. The mother will be twice as old as the daughter in twenty years. How old is the mother, and how many are the daughter? - Creatures 3607
The collector of beetles and spiders had ten creatures in a box. There were a total of 72 legs in the box. How many beetles and how many spiders? - One-thirds 3606
They baked one-third of the flour on the first day in the bakery and used 75% of the rest the next day. On the third day, 120 kg of flour remained. How much flour did they have in the beginning? - Achieve 3605
Jarda scored 18 goals more than Karel. They scored a total of 86 goals. How many goals did Jarda achieve, and how many did Karel score? - Mushrooms
Eva and Jane collected 114 mushrooms together. Eve found twice as much as Jane. How many mushrooms were found in each of them? - Internal angles
Find the internal angles of the triangle ABC if the angle at the vertex C is twice the angle at B and the angle at the vertex B is 4 degrees smaller than the angle at vertex A. - Inequality with fraction
(1 + 3x) / (x-2)> 3 - Cylinder:
Cylinder: calculate the height of a 3-liter cylindrical pot with a diameter of 10 cm. - Gingerbreads 3599
Janko and Marienka ate 36 gingerbreads together. Janko ate 14 more gingerbread. How many gingerbreads did Marienka eat? How much did Janko eat?
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