Math practice for 13 year olds - page 288 of 413
Number of problems found: 8260
- Filament of bulb
A light bulb's filament has a resistance of 1 ohm and is connected to a voltage of 220 V. How much electric charge will pass through the filament in 10 seconds? - Grandfather and grandmother
The old mother is five years younger than the old father. Together, they are 153 years old. How many years has each of them? - Two trains
There were 159 freight wagons at the railway station creating two trains. One had 15 more wagons than the other. How many wagons did each train have? - Birthday
A mother bought 21 desserts for her daughter Mira's birthday. One type of dessert cost 9 CZK and the other cost 12 CZK. She paid 213 CZK in total. How many of each type did she buy? - Coulombs
How long does it take for a 15 C charge to cross the conductor's cross-section if a 3 mA current passes through the conductor? - Endless lego set
The endless Lego set contains only 6, 9, and 20-kilogram blocks that can no longer be polished or broken. The workers took them to the gym and immediately started building different buildings. And, of course, they wrote down how much the building weighed. - Electric Kettle Current
The kettle is connected to a voltage of 230 V. Its resistance is 130 ohms. What is the current flowing through the kettle? - Triangle perimeter
An isosceles triangle with a base length of 32 cm has an area of 480 cm². What's his perimeter? - Volume and body diagonal
Calculate how much the cuboid's volume and body diagonal decrease if we reduce each of its three edges, a, b, and c, by 18%. - Pendulum
Calculate the pendulum's length 2 cm lower in the lowest position than in the highest position. The circular arc length to be described when moving is 20 cm. - Highway tunnel
The company built the highway tunnel from two ends in the north-south direction. The average daily performance of the "northern party" rasters was higher than the average daily power of the "southern party" rasters. After 55 business days, both parties me - Aquarium
There are 15 liters of water in a block-shaped aquarium with internal dimensions of the bottom of 25 cm and 30 cm. Find the area of water-wetted surfaces. Express the result in dm square. - Gas tank
The car's tank was two-twelfths full. When Dad filled the tank with gas, the volume of gas increased by five-eighths of the tank's volume. What fraction of gasoline did the car use when the tank is now 1/3 full? - Solving System of Equations
Solve the system: 2 * (x-2) = 6y + 6 y-x = -2 - Vehicle speed
The distance between the two cities is 60 km. It takes a slower vehicle half an hour longer to travel this distance than a faster one traveling at speed 50 percent faster. How fast is each vehicle going? - Product Cost Weight Distribution
If you know that the company produces four similar products that differ only in the weight of the packaging, determine the final price of the product in terms of costs. The total cost of manufacturing the product was CZK 5,745,000. And 10 kg 15,000 pcs B - Parallelogram Height Area
Calculate the height of the parallelogram, which has an area of 2.31 square meters and a side of 15.4 cm. - Garden fence
The garden has the shape of a rectangular triangle with an area of 96 square meters and a 16 m long leg. How many meters of the fence need to be fenced? - Triangle Side Lengths
The triangle has side lengths expressed in whole centimeters. One of them measures 8 cm, and the sum of the remaining two sizes is 32 cm. Determine the lengths of the remaining sides. Find all solutions. - University students
One company employed a university student on a farm for the entire month of June by paying him €16 and a full board for one day. If he did not work that day, he had to pay €6 for the meal. How many days did the student work if he earned €348 in the month
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