Maths practice for 14 year olds - page 181 of 361
Number of problems found: 7217
- LED circuit calculation
The LED parameters are: ULed is 3 V, Current 100 mA Take measures so that the LED at the U 12 V supply is not destroyed. Perform the calculation and also the wiring diagram. - Copper heat calculation
What heat do we need to supply a copper body weighing 8 kg to raise its temperature by 136 degrees Celsius? - Triangle base calculation
They make bases for table lamps from bronze in the shape of an isosceles triangle. How many m² are needed for 5 mats if the arms are 24 cm long and the height to the triangle's base is 1.5 dm? - Pyramid volume calculation
Calculate the volume of a regular quadrilateral pyramid, which has the size of the base edge a = 8 cm and the length of the side edge h = 9 cm. - Chocolate purchase calculation
The kindergarten purchased 40 chocolates of two types. Dairy is sold after 16 CZK per piece, and hazelnut after 11 CZK per piece. They paid a total of CZK 565. How many chocolates were there? - Runners
If John has a running speed of 3.5 miles per hour and Lucy has a speed of 5 miles per hour. If John starts running at 10:00 AM and Lucy starts running at 10:30 AM, what time will they meet? (as soon as possible) - Ladder height calculation
The 8-meter-long ladder is attached to the wall at an angle of 22 °. How high does it reach? - Block material calculation
How many square meters of material is needed to make two identical blocks with dimensions of 6 dm, 8 dm, and 12 dm if we count 8% of the material for folds? (Round to two decimal places. ) - Four-digit number creation
How many can we create four-digit numbers that digits can repeat from digits 0,1,2,3,…, 9? - Birth
Let's assume that the probability of the birth of a boy and a girl in the family is the same. What is the probability that the youngest and oldest child in a family with five children is a boy? - Adding
Divide number 135 into two additions, one adding 30 more than 2/5 of the other. Write the bigger one. - Pizza percentage remaining
The pizza has the shape of a circle and is divided into eight equal parts. My mother ate three parts. What percentage of pizza is left? - Two-digit number puzzle The sum of the digits of a two-digit number is 8. If we change the order of the digits, the result is 36 smaller. Find this number.
- Volume of wood
Every year, at the same time, an increase in the volume of wood in the forest is measured. The increase is regularly p% compared to the previous year. If in 10 years the volume of wood has increased by 10%, what is the number p? - Money circulation speed
Calculate the speed of money circulation, if you know: the amount of money in circulation: 95 million. €, nominal GDP is 1460 million. €. - Power line pole
From point A, the power pole is visible at an angle of 18 degrees. From place B, which we reach if we go from place A 30 m towards the pillar at an angle of 10 degrees. Find the height of the power pole. - Percents from percent
How much is 13% of 20% of 500 greater than 8% of 14% of 200? - Lemonade
Eve added one liter of 100% fruit juice to three liters of water, leaving two liters for Alice and Bertha. She then added two more liters of water to the remaining two liters of lemonade and offered it to other friends. a. What percentage of juice did Ali - Aircraft angines
The aircraft's two engines are enough to supply the fuel for five hours of operation. However, one of the engines has malfunctioned and thus consumes one-third more fuel. How long can the plane be in the air before it runs out of fuel? After an hour of ma - Raindrops
The train runs at a speed of 14 m/s, and raindrops draw lines on the windows, forming an angle of 60 degrees with the horizontal. What speed do drops fall?
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