Math practice for 13 year olds - page 244 of 415
Number of problems found: 8281
- Family 5
The Plavecký family built a pool which is 120 cm deep. a/The bottom of the pool has a thickness of 10 cm, the side walls 20 cm. The pool has the shape of a cuboid with a base of 3 m x 5 m. How many cubic metres did they use for its construction? b/Their s - Banknotes
Eve deposited 7800 USD in 50 banknotes in the bank. They had a value of 100 USD and 200 USD. How many were they? - Poplar
How tall is a poplar by the river if we know that 1/5 of its total height is a trunk, 1/10th of the height is the root, and 35m from the trunk to the top of the poplar? - National park
In the national park, the ratio of the wooded area to grassland is 4:1. The total area is 385 km². What area is wooded? - Filling Cylindrical Pool
The outdoor pool has a cylindrical shape with an inner diameter of 3.6 m and a depth of 1.2 m. a) how long will it take to fill if 2 liters of water flow per second? b) how many crowns will it cost to fill the pool? (find out the price of 1 m³ of water. ) - Water Height Cylinder Diameter
How high will 1 liter of water in a cylindrical vessel with a bottom diameter of 8 cm reach? - Juice Container Diameter Volume
What diameter will a 20 cm high cardboard juice container have to fit half a liter? - Connected 3 gears
There are three connected gears. Wheel A has 30 teeth, wheel B has 15 teeth, and wheel C has 20 teeth. How many turns does wheel A make when wheel C turns nine times? a) 6, b) 5, c) 4 d) 8 - Block Volume Surface Ratios
The volume of the block is 5760 cm³. For the dimensions of a given block, a: b = 4:3, b: c = 2:5 Calculate its surface. - Isosceles Trapezoid Sides Angle
ABCD isosceles trapezoid. A = 6 cm, e = 7 cm and delta angle = 105 °. Calculate the remaining pages. - Photo Enlargement Dimensions
The photo has 6 cm and 9 cm dimensions and should be enlarged 8:3. What will be the dimensions after magnification? - Tricycle scooter assembly
John had 19 wheels in the kit. He used all these wheels in the construction of tricycles and scooters. How much does he assemble complete scooters, and how many tricycles? Find all solutions. - Did not use
A father, mother, three children, both grandmothers, and both grandfathers were sitting at the table. Three of the family members used both a knife and a fork while eating. This is exactly half of those who used a fork, and exactly three quarters of those - Cranberries
They brought 65 kg of dried cranberries to the packing house. They made 150-gram and 200-gram packages from them. How many kilograms of cranberries did they use for the smaller 200 packages? How many 200-gram packages were there? - Wood beam drying
The raw wood beam weighs 85 kg. It is calculated that drying will reduce its weight in a ratio of 5:6. What will be its weight after drying? - Cuboid Dimensions Ratio Sum
The cuboid’s dimensions are in the ratio of 16:12:8, and the sum of these dimensions is 180 dm. What are the dimensions of the cuboid? - Year digit product
How many years will elapse from 1 January 2013 before the situation occurs that the product of the digits of a given year is greater than the sum of the digits of that year? A) 87 b) 98 c) 101 d) 102 e) 103 - Solve Complex Equation
Solve the equation: 10x + 13-9 = (2001 + 4) / 5 + 130-101 - Cake Profit Percentage
The purchase price of the cake is 11.5. The selling price is 16.5. What is the yield in% when selling 950 and 1200 pieces? - Plot Map Scale
The rectangular plot has dimensions of 50 m and 100 meters. On the plain, its circumference is 60 cm. To what extent is the plan made?
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