Math practice for 13 year olds - page 175 of 428
Number of problems found: 8555
- How many 9
How much percent volume remains of a sphere if the diameter decrease 3×? - Flower petal
We have 30 flowers, and each one has three or four petals. They have a total of 102 chips. How many flowers have four petals? Z represents the number of flowers with 4 petals. Choose the expression that determines the number of flowers with 3 petals. - Wholesale vs retail
For books, retail adds 10% of the wholesale price of the goods. If the book costs 4.80 euros wholesale, how much will it cost in retail? - Ratio in trapezium
The ratio of the height v and the base a, c in the trapezoid ABCD is 1:6:3. Its area is 324 square cm, and the peak angle B is 35 degrees. Determine the perimeter of the trapezoid. - Free fall
How long and at what speed does the body fall to the ground during a free fall from a height of 35 m? - The average height
The average height of six friends is 181 cm. Peter came among them, which reduced the average height by 2 cm. Calculate Peter's height. - Salt solution preparation
Prepare 2 liters (kg) of a 3% salt solution in water. - Hydrogen peroxide solution
Prepare 250g of a 30% solution of hydrogen peroxide in water. - Salicylic acid solution
Prepare 600 g of an 8% solution of salicylic acid. - Blue rock solution Prepare 100g of a 15% blue rock solution.
- Odd number creation
How many odd three-digit numbers can you make of the five cards with the numbers 1, 2, 3, 5, and 6? - Plane distance
Two planes took off from Prague at one point. The first is flying north at a speed of 420 km/h, and the second is flying east at a speed of 560 km/h. How far apart will they be as the crow flies in 25 minutes of flight? - Regular 4-sided pyramid
Find the area (surface area) of a regular 4-sided pyramid if its height is 20 m and the wall height is 23 m. - Clock hand distance
How far apart are the tips of the clock's hands in 3 hours if the larger hand is 124 mm long and the smaller 75 mm? - Cube-shaped container
The cube-shaped container has a height of 52 cm and a square base. The container was filled to the brim with water, and then we immersed a metal cube in it, which caused 2.7 l of water to flow out of the container. After removing the cube from the water, - Bricklayer work
A bricklayer will lay 12 m³ of brickwork in 4 days if he works 7 hours a day. How many days will he lay 51 m³ of masonry if he works 8.5 hours daily? - Rotary motion Find the orbital time, rotational frequency, and angular rate of the second and minute hands on the watch.
- Coat price difference
The blue coat, which costs CZK 1,200, has a price 40% lower than the red coat. What is the price difference between the two coats? - Isosceles + prism
Calculate the volume of the perpendicular prism if its height is 17.5 cm and the base is an isosceles triangle with a base length of 5.8 cm and an arm's length of 3.7 cm. - Lions
If eight lions are 40%, how many would 75% be?
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