Math practice for 13 year olds - page 167 of 434
Number of problems found: 8666
- Largest possible cone
It is necessary to make the largest possible cone from an iron rod in the shape of a prism with dimensions of 5.6 cm, 4.8 cm, and 7.2 cm. a) Calculate its volume. b) Calculate the waste. - The length 2
The length of a rectangle is 12y² – 15y + 8, and the width is 7y – 11. Find the area of the rectangle. - Rollers 40841
Two rollers weigh the same as three dice. One roller with two dice weighs the same as three with a weight of 250 grams. How many grams does the roller weigh, and how many dice? - Pedestrians 40811
From Tatranská Lomnica to Ždiar, 40 km apart, two groups of tourists went opposite each other. Pedestrians left Tatranská Lomnica at 9:00 AM at an average speed of 4 km/h. Cyclists from Ždiar at 9:30 at an average speed of 15 km/h. When will they meet? At - Brno-Tachov highway
The distance Brno-Tachov is 360 km. At 8:00 AM, a car travels from Brno on the highway at an average 90 km/h speed. An hour later, a vehicle leaves Tachov towards Brno, whose average speed is 110 km/h. Calculate how far apart they will be at 11:00 AM when - There 5
There were 429 people at the play. Admission was 50 pesos each for adults and 35 pesos each for children. The receipts were 17265 pesos. How many adults and how many children attended? - 80-kilogram 40741
The 80-kilogram man who caused the car accident had 2.5% blood alcohol. Determine how many grams of alcohol he had in his blood if the blood made up 8% of a person's weight.
- The cost
The amusement ticket costs 250 pesos for children and 500 pesos for adults. On a certain day, attendance at the park is 2,000, and the total revenue is 750000 pesos. How many children and how many adults bought the tickets? - Determine
Determine the salary of a part-time worker if the employer deducted (taxes, etc.) 840 euros from him, which was 6/50 of his salary. - Erik
Three friends, Peter, Erik, and Milan, shared 420 euros in a ratio of 1:2:3. How many euros did Erik get? - Two markers
Two markers and one eraser cost 35 pesos, and three markers and four erasers cost 65 pesos. Find the cost of a marker and an eraser. - Arithmetic 40671
The number 20 is the arithmetic mean of the eight numbers. Determine their sum. - The grocery store The grocery store earned € 15450 in the first week. In the second € 18630. What percentage of sales increased in the second week compared to the first week?
- Darnell
Darnell is mountain climbing with Kirk and has just climbed a 9-meter vertical rock face. Kirk is standing at the bottom of the cliff, looking up at Darnell. If Kirk is 15 meters away from Darnell, how far away from the cliff is Kirk standing? - Tributaries 40641
We would fill the water tank with one inflow in 3 hours and the other inflow in 2 hours. How long will it take for both tributaries to open?
- Barrel-shaped 40601
The barrel-shaped cylinder has a volume of 9.42 hl, and the inner diameter of the bottom is 12 dm. Calculate the area of the barrel shell in m². Solve in general first. - Tennis racket
Tennis rackets became cheaper by 16% in winter. In the spring, the price increased by 15%. After this increase, it cost € 38. How much did the rocket cost in the winter before cheapening? - Surface and volume - cube
Find the surface and volume of a cube whose wall diagonal is 5 cm long. - Quadrilateral 40551
Find the volume and surface area of a regular quadrilateral pyramid ABCDV if its leading edge has a length a = 10 cm and a body height h = 12 cm. - Discount 40531
The shop with fur coats has a red fur coat that costs 150 euros, with an 85 percent discount. How much does it cost after the discount? If there was an 85% discount, how much would it cost?
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