Math practice for 13 year olds - page 339 of 414
Number of problems found: 8279
- Sum probability
Natural numbers 4,5,7,11,12 are given. Calculate the probability of the event that the sum of three randomly selected numbers is less than 22. - Class 9A
On the final certificate, one-quarter of the class 9 A marked “C” in mathematics, the seventh mark “C” from the Czech language, and two students failed in chemistry. How many students attend class 9 A? - Pipe surface
Calculate the surface area of a pipe section if: outer diameter = 40 cm; length = 3 m - Water reservoir
The water reservoir is filled with one pump for four days by the second one for nine days. An outlet can drain the tank in 12 days. How long does it take to fill the reservoir if both pumps are running and not closed outlet channels? - Shadow and light
Nine meters height poplar tree has a shadow 16.2 meters long. How long does shadow have at the same time as Joe if he is 1,4 m tall? - Two numbers
The sum of the two numbers is 98. The first number is 4/3 times larger than the second. What are the numbers? - Cone area and side
Calculate a rotating cone's surface area and volume with a height of 1.25 dm and 17,8 dm side. - Cylinder surface area
The volume of a cylinder whose height is equal to the radius of the base is 678.5 dm³. Calculate its surface area. - Birthday ages
Linda and her uncle Slavo have birthdays on the same day. A few years ago, Linda was 13, and her uncle was 45. How many years ago was it today that Uncle Slavo was three times older than Linda? - Metals
Eight teams play in the Hockey World Cup. Determine how many ways gold, silver, and bronze medals can be awarded. - Two numbers
The sum of two numbers is 1. Identify these two numbers if you know that half of the first is equal to the third of the second number. - Roll the dice
What is the probability that if we roll the dice, a number less than five falls? - Pool percentage
Nine hundred hectoliters of water were filled into the cylinder-shaped pool. The pool is 1.5 m deep, and its diameter is 10 m. What percentage of the pool volume has the water-filled? - Hexagonal pyramid
Calculate the volume and the surface of a regular hexagonal pyramid with a base edge length of 3 cm and a height of 5 cm. - Square root calculation
Determine an unknown number equal to two-fifths of the square root of 49. - Raspberry baskets
Find how many raspberries are in the third and tenth baskets, if there are three raspberries in the first and eight raspberries more in each. - Weight ratio
Andrew, Michael, Patrick, and George together weigh 128 kg. Their weights are in the ratio 1:6:7:2. Determine what weight each of them has. - Three numbers
Find three numbers so that the second number is three times larger than the first and the third is six larger than the second number. Their sum is 62 - Consecutive numbers
The sum of four consecutive odd numbers is 240. What are the numbers? - Suit price
The webshop reduced the price of the suit by p percent. What was the new cost of the suit?
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