Math practice for 13 year olds - page 309 of 424
Number of problems found: 8462
- Diameter
What is the inside diameter of the cylinder container if half a liter of water reaches a height of 15 cm? - Fifth of the number
A fifth of the number is 24 less than that number. What is the number? - Six years
In six years, Jan will be twice as old as he was six years ago. How old is he? - Father and son
The father is 48 years old, and the son is 23. When will the father be twice as old as the son? - Remaining 4989
The seller sold 40% of the fruit on the first day, 2/3 of the rest on the second day, and the remaining 20 kg on the third day. How much fruit did he sell in those three days? - Children pool
The bottom of the children's pool is a regular hexagon with a = 60 cm side. The distance between opposing sides is 104 cm, and the height of the pool is 45 cm. A) How many liters of water can fit into the pool? B) The pool is made of a double layer of pla - Hexagonal prism
The prism's base is a regular hexagon consisting of six triangles with side a = 12 cm and height va = 10.4 cm. The prism height is 5 cm. Find the volume and surface of the prism. - Force meter
We put the statuette on the force meter, which showed a value of 25 N. Then, we placed it on the force meter, completely immersed in the water. The force meter showed a value of 17 N. What is the statuette's volume? - Parallelogram
We know about parallelogram ABCD: length |AB| = 76cm, |BC| = 44cm, and angle ∢BAD = 30°. Find the area of the parallelogram. - Grandfather The grandfather is three years older than the grandmother. The average age of the grandmother, the grandfather, and their seven grandchildren is 28. The grandchildren have a total of 105 years. Calculate how old grandfather is.
- Square circles
Calculate the length of the described and inscribed circle to the square ABCD with a side of 5cm. - Czech crown salary
The employee's monthly salary is CZK 10,800. In the course of the year, the bulk salary increased by CZK 500. Calculate which employer increased month (1 ... 12) if its annual income was 133,600 CZK. - Candies
There are two types of candies in the store 20 CZK/kg and 80 CZK/kg. How much will a mixed cost if we mix 22kg cheaper and 4kg more expensive candies? - Isosceles trapezoid
What is the height of an isosceles trapezoid, the base of which is 11 cm and 8 cm long, and whose legs measure 2.5 cm? - Illuminates 4961
The lamp illuminates a circle with a diameter of 10m. What area does the light illuminate? - Prices prices
Factory reduced the meter of the textile by CZK 42, so 4 meters of the new price was 20 CZK cheaper than 3 meters of the original price. What was the original and new price of the textile? - Waste - cutting metal
In the workshop, they cut 50 circles with a diameter of 9 cm from a rectangular sheet with dimensions of 50 cm and 100 cm. What percentage of the sheet was a waste? - Increase 4957
How does the area of a circle change if we double its radius? How many times does its area increase? - Circumference 4956
Calculate the circumference of a diamond whose area is 288cm square and one diagonal is 12.4cm. - Oil tank and pipes
Two oil pipelines can fill the underground oil tank. The first is filled in 72 hours, and the second in 48 hours. How many hours from when the first pipeline began to fill the oil is necessary to start filling it with the second to fill in 1 and 1/2 days?
Do you have unsolved math question and you need help? Ask a question, and we will try to solve it. We solve math question.
