Math practice for 13 year olds - page 289 of 420
Number of problems found: 8399
- Tetrahedron
What is the angle of the sides from the base of a three-sided pyramid where the sides are identical? - Eighth Grade Boys Girls
Fifty-six pupils attend the eighth grade of primary school. There are 18 more boys than girls. How many boys and girls are in the eighth grade of primary school? - Egg Delivery Plan Variance
The poultry farm supplied 50,000 eggs per year. According to the plan, it was supposed to deliver 20% of the annual task in April and 16% in May. In April, it exceeded the monthly plan by 830 eggs; in May, it failed to deliver 260 eggs against the plan. W - Basketball Shooting Success
The boy was practicing shooting at the basket. Out of the first 12 attempts, he missed 9 times. He was successful in all other attempts except a single penultimate throw. He thus achieved exactly half the success rate (he hit the basket in half of the att - Socík
On the construction site of a new housing estate in Kladno-Kročehlavy, students from the state labour reserve carried out machine plastering of the masonry. 5 students using machines plastered 10 square metres more masonry than 6 plasterers working by han - Boys and Girls in Class
The class has 24 pupils, with 40% fewer boys than girls. How many boys and girls are in the class? - Washing Machine Discount
The washing machine became cheaper by 43.5 euros, which is 15% of the old price. What is the new price? - Finding a Number
I think the number if I assign 8 (add) to it and divide the result by two, I get a number 46 less than the number, I guess. What number do I think? - Mixture
How many percentage mixtures do we get by adding 23 ml of matter to 89 ml of water? - Washing Powder Duration Andrew found that three-quarters of a bag of washing powder was used up by his family in 12 weeks. How many more weeks will the remaining powder last? How long does a whole bag of washing powder last?
- Two annuluses
The area of the annular circle formed by two circles with a common center is 100 cm². The radius of the outer circle is equal to twice the radius of the inner circle. Determine the outside circle radius in centimeters. - Mother and Child Age
A mother is 21 years older than a child. In 6 years, the mother will be five times more than the child. Question: Where's Dad? - Diagonal
The rectangular ABCD trapeze, whose AD arm is perpendicular to the AB and CD bases, has an area of 15 cm². Bases have lengths AB = 6 cm and CD = 4 cm. Calculate the length of the AC diagonal. - Work
The first worker would need less than 4 hours to complete the task than the other worker. In fact, both workers worked for two hours together. Then, the first worker did the remaining work himself. In what proportion should the remuneration of the workers - Orchard
One-eighth of the trees in the fruit plant in winter froze, and one-twelfth were damaged by disease and pests. Healthy trees remained 152. Is it enough to supply 35 trees to restore the original number of trees in the orchard? - Digit sum The digit sum of the two-digit number is nine. When we turn figures and multiply by the original two-digit number, we get 2430. What is the original two-digit number?
- 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?
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