Math practice for 13 year olds - page 247 of 415

Number of problems found: 8281

Gas tank capacity
The gas tank is a sphere with a diameter of 17.8 m. How many cubic meters of gas can it hold? If 1 kg of paint is enough to paint about 6 square meters, how many kilograms of paint are needed to paint a gas tank?
Two Numbers Product Ratio
The ratio of two natural numbers is 2:3. The smaller number naturally is 12. What is the product of these numbers?
Cube surface and volume
The surface of the cube is 500 cm². How much cm³ will its volume be?
Trapezoid Circumference Area
The bases are 9 cm and 5 cm long in a rectangular trapezoid. The length of the shorter arm is 3 cm. Calculate its circumference and area.
Chocolate ball comparison
What should a sweet tooth choose if he wants more chocolate: a package containing 200 pieces of solid chocolate balls with a diameter of 1 centimeter or a hollow ball with an outer diameter of 10 cm made of 5 mm thick chocolate?
Equilateral tetrahedral pyramid
The base edge of a regular tetrahedral pyramid is a = 4 cm. The base and walls are equilateral. Calculate the surface of this pyramid.
Concentric Circles Area
The small circle in the picture has an area of 3.5 cm². It touches from the inside and passes through the center of the large circle. What is the area of a large circle? The result round to an integer.
Unknown mixed number
Find the number that is smaller than 5 5/12 by as much as 2 2/13 is smaller than 6 1/6
Probability of Ball Number
We have 20 balls in the bag, numbered from 1 to 20. Determine the spring probability that I will pull a ball with a steam number and less than 13 from the bag.
Reward money distribution
Mr. Trnka received a reward. He put half of it in the passbook, gave two-thirds of the rest to his wife, and still had € 1,200 left. How much did Mr. Trnka receive?
Three Painters School Days
One painter would paint a school by himself in 28 days. The second painter would paint the school by himself in 24 days. They also called a third painter because they needed to paint the school in 8 days. The three of them painted the school together in 8
Secret Society Gender Ratio
There are eight boys and twelve girls in the secret society. How many boys must they accept so that the ratio of boys to girls is 3:4
Average Grade Goal Worst
Johnny has committed that his average grade in mathematics will be exactly 2 at the end of the semester. However, so far, he has received grades 3 and 4. He knows that by the end of the year, he will receive four more grades from the tests. What are the w
Pool Wall Above Water
The garden children's pool has the shape of a cylinder with a base diameter of 3.2 m and a depth of 60 cm. The water reaches 10 cm below the top edge. How many m² of the surface of the cylindrical wall of the pool is above the water? Rounds to the whole m
Plates - gold
The father bequeathed to his two sons 4 gold plates in the shape of a square, which were 1 mm thick. The side lengths of these plates were 5 cm, 10 cm, 10 cm, and 15 cm. The sons were to receive the same amount of gold. How many gold plates did each son r
Pool filling time
The garden children's pool has the shape of a cylinder with a base diameter of 3.2 m and a depth of 60 cm. How many hours and minutes will it fill 10 cm below the edge of 0.5 l of water per second flows through the tributary? Round to whole minutes and wr
Pages counting
There are pages numbered 2 to 104 in the book. How many digits have to be printed to number the pages?
Dividing a Circle
Draw a circle k, r = 4 cm, and divide it into two parts in a ratio of 1:5.
Persons
Persons surveyed:100 with the result: Volleyball = 15% Baseball = 9% Sepak Takraw = 8% Pingpong = 8% Basketball = 60% Find the average of how many like Basketball and Volleyball. Would you please show your solution?
Simplify
Simplify expression - which expression is equivalent to: 3(m + 2) − 4(2m − 9)

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