Math practice for 13 year olds - page 174 of 414
Number of problems found: 8280
- Erik
Three friends, Peter, Eric, and Miles, shared 420 euros in a ratio of 1:2:3. How many euros did Eric receive? - 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. - Number arithmetic mean
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? - Tank inflow time
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? - Sphere volume
The surface of the sphere is 535 m². What is its volume? - Barrel shell
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 face diagonal is 5 cm long. - Pyramid volume surface
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. - Fur coat discount
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? - Shopping discount
The Kováčov family makes a purchase at a nearby store once a week for €45. After the opening of the new shopping center, the family's monthly purchases are a tenth cheaper. Calculate how many euros the Kováčovci will pay per week for shopping after the op - Metal washers
Metal washers with a diameter of 80 mm are cut from a strip of steel sheet with a width of 10 cm and a length of 2 m. When two adjacent circles meet, calculate the material waste percentage if no material is lost. - Average weight
Mom bought six apples with an average weight of 130 g - If she took one apple out of the bag, the average weight of the remaining apples changed to 140 g. What was the weight of the removed apple? - Tangens parallelogram
If ∠BAD between the sides AB and AD of the parallelogram is θ, what is tan θ? See diagram: A=(7,1) B=(5,-2) C=(12,1) D=(14,4) - Circle diameter
Calculate the diameter of a circle whose area in cm² and the circumference in cm are expressed by the same number. - Wheel water depth
A pole is stuck in the water. 40 cm is in the ground, 2/3 of the length is in the water, and 1/5 of the length is above the water. How long is the pole, how many cm is in the water, and how much is above the water? - Circuit voltage
Calculate the closed-circuit voltage. Calculate the power on the resistors. R1 = 30 ohms, R2 = 10 ohms. I = 0.1 A. U =?. The resistors are connected in series, one after the other. - Mushrooms
The mushroom picker had 110 mushrooms in the basket. He had 36 mushrooms less than cossacks. How many mushrooms did he bring if he only had cossacks and mushrooms in the basket?
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