Maths practice for 14 year olds - page 220 of 361
Number of problems found: 7217
- Mixing water
We should fill the 30-liter container with water at 60 degrees Celsius. How many liters of 80 °C water and how many liters of 20 °C water do we need to mix? - Rubber ball purchase
The municipal authority purchased 36 large and 25 small rubber balls for the children in the kindergarten. They paid as much for two large balls as for five small ones. The invoice was issued for CZK 5,980. How much did the big ball cost? - Number summand division
Divide the number 4600 into two summands so that one summand is 700 larger than half of the other summand. - Cylinder height
Calculate the height of a cylinder whose total surface area is 2,500 dm² and whose bases have a diameter of 5 dm. - Astronomical units AU
The given numerical data are the mean distances of planets from the Sun expressed in astronomical units. One astronomical unit is the mean distance of the Earth from the Sun, and approximately equals 150 000 000 km. Express the given mean distances in met - Working together
One worker performs work in 3 days, the second in 5 days. How much do they work together? - Three unknowns
Solve the system of linear equations with three unknowns: A + B + C = 14 B - A - C = 4 2A - B + C = 0 - Find sales tax
What is 8.25% sales tax out of 1607.00? - Chocolates
How many ways can we distribute eight different chocolates to four children? - Mother Children Shopping Puzzle
Mom sent half of her children and half a child shopping. Only one of her children remained at home. How many children does my mother have? - Hexagon in circle
Calculate the radius of a circle whose length is 10 cm greater than the circumference of a regular hexagon inscribed in this circle. - Combinations 7
A multi-course meal has three choices. Three appetizers, four main courses, and three desserts. How many different combinations to choose from? - Children weight puzzle
Max and Katy weigh 75 kg together, Katy and Tina weigh 71 kilograms, and Max and Tina weigh 80 kilograms. Thus, each of the children weighs 75 kilograms. - Two Workshops Production Days Two workshops of a particular company produced 25 parts a day. To have 300 pieces, one worked for ten days and the other for 15 days. How many parts did each workshop make per day?
- Water reservoir
One drain hole emptied the water from the tank for 20 hours, with the second drain for 30 hours. How long will the water drain from this tank if we open two drains simultaneously? - Darts Score Combinations
Adam was practicing for a darts competition in class. Every day at home, he threw darts at a target in which the individual fields were worth 1,3 and 5 points. He threw 9 darts every day and always scored 27 points. He is in good form and never missed a t - Three-digit numbers
Use the number 4,5,8,9 to write all three-digit numbers without repetition. How many such numbers are there? - Beds
At the summer camp, there are 41 chalets. Some rooms are 3 beds, some 4-beds. How many campers from 140 are living in 3-bed? - Uncle Nephew Age Puzzle
Uncle Josef is three times as old as Michael. Twelve years ago, Josef was nine times older than Michael. How old are they now? - Tea Left in Kindergarten
The children in the kindergarten drank 20% of the prepared tea in the morning. They drank another 10% of the left tea afternoon. After the whole day, there were still 9 liters of tea left. How many liters of tea was prepared in the kindergarten in the mor
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