Math practice for 13 year olds - page 158 of 434
Number of problems found: 8668
- Travelogues 45401
Martina borrowed three novels and two travelogues from the library. He will read the travelogues first. How many ways can he read the books? - Top-open tank
The top-open tank resembles a truncated rotating cone, standing on a smaller base. Its volume is 465 m3, and the bases' radii are 4 m and 3 m. Find the tank's depth. - The truncated
The truncated rotating cone has bases with radii r1 = 8 cm, r2 = 4 cm, and height v = 5 cm. What is the volume of the cone from which the truncated cone originated? - We roll
We roll two dice A. - what is the probability that the sum of the falling numbers is at most 4 B. - is at least 10 C. - is divisible by 5? - Difference 45311
Calculate the product of the sum and difference of the numbers of the square root of 5 and the square root of 3 (in this order). - Successive 45281
The sizes of the interior angles of the triangle are in a successive ratio of 6:4:5 are these angles big? - Students 45261
There are 200 pupils in the class, 40% of whom cannot swim. How many students can swim?
- Workshops
The plant has three workshops. In the first workshop, produce five products/hour. In the second 8 products/hour, and in the third, seven products/hour. In the first workshop, they produced 240 products. In the second 400 and the third 350 products. Find t - Czech coins
John has 540 CZK, but he only has 10 and 20 CZK coins. We know that he has 10 CZK coins, seven times more than 20 CZK coins. How many 10CZK coins and how many 20CZK coins did he save? - Flower box
A wooden flower box in the shape of a cuboid has the following external dimensions: length 120 cm, width 15 cm, and height 20 cm. It is made of wooden slats 1.5 cm thick. a) At least how many m² of slats were needed to make it? Calculate according to the - A wheat
A wheat factory packages wheat in sacks of three different colors. The following table shows the amount of wheat (in kg) packed in each type of sack. White sack 2 kg Brown sack 3 kg Black sack 4 kg What is the total amount of wheat (in kg) which can be pa - Quadrilateral sides
What is the perimeter of a quadrilateral whose first side is 3 cm longer than the second side, the third side is 5 cm shorter than the fourth side, and the second side is 2 cm shorter than the fourth side? - Contains 45031
How many cars can we mark with signs that only use the letters A, B, and the number 1,2? The tag contains two letters and three digits. - Approximately 44981
The largest Egyptian pyramid has the shape of a regular four-sided pyramid with a base edge of approximately 227 meters and a height of about 140 meters. How many tons of stone did the workers transport to build it? One cube of stone weighs 2500 kg and ne - The golf
The golf ball with a diameter of 43 mm is packed in a cube-shaped box. What percentage of the box volume is made up of a ball?
- Rectangular 44951
The surface area of the rectangular plot needs to be increased by 33.7 percent. One dimension was extended by 2.9 percent. By what percentage should the second dimension be increased? Round the result to two decimal places. - Electrical 44931
A current of 20 A passes through the heating spiral of the electric fireplace with a resistance of 10Ω for 2.5 hours. Determine the power input of the fireplace and the consumed electrical energy - A number 4
A number is made up of two digits. The sum of the digits is 11. if the digits are interchanged, the original number increases by 9. Find the original number - Ramon
Ramon earns 1,810 each month and pays a 53.20 bill on electricity. To the nearest tenth of a percent, what percent of Ramon's earnings are spent on electricity each month? - Block-shaped 44771
How much m² of paper do we save if we do not glue one-third of the total area of the block-shaped billboard area with dimensions of 0.6 m, 0.7 m, and 1.4 m?
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