Math practice for 13 year olds - page 175 of 414
Number of problems found: 8280
- The quotient 2
The quotient of the quantity k minus 10 and m. - The box
Does the box contain three light bulbs with a wattage of 40 W and two pieces of light bulbs with a wattage of 60 W. What is the probability of the event that two randomly selected light bulbs will both be 40 W? - The nuts
There are 159 nuts in two bags, 15 more in the first than in the second. How many nuts are in the bags? - They competed
On April Fools' Day, the seventh graders competed to see who could write the worst dictation. The winner was Jožo Poleno, who omitted a letter in a third of the words, made bolding errors in a quarter, forgot the soft sign in a sixth, and despite all his - Together m+d
Aunt Jane would paint her apartment in 10 hours and her mother in 15 hours. How much do they paint it together? - Triangular prism
The regular triangular prism has a base edge of 8.6 dm and a height of 1.5 m. Find its volume and surface area. - Bulb resistance
At a certain point, we measured a voltage of 4.5 V at a current of 150 mA at the bulb's terminals connected to the electrical circuit. What is the resistance of the bulb? - The rotating
The rotating cone has a height of 0.9 m, and the diameter of the base is 7.2 dm. Calculate the surface of the cone. (Hint: use Pythagorean theorem for a side of cone) - The volume
The volume of a cone is 94.2 dm³ and the base radius is 6 dm. Calculate the total surface area of the cone. - Perpendicular legs PT
In a right triangle, one leg is 5 cm longer than the other leg. The hypotenuse is 150 mm. Calculate the lengths of the legs. - Student exam probability
There are 28 students in the IK3 class. Three pupils will be examined. Nineteen pupils are ready for the exam. What is the probability that all three will be unprepared? - Cheetah antelope pursuit
The antelope was 100 m away from the cheetah. The moment the cheetah started running, antelope took off running. The cheetah ran at an average speed of 1200 m per minute, and the antelope 700 m per min. In how many seconds was the cheetah able to catch up - Honor graduate percentage As many as 62.5% of residents at the business academy graduated with honors. How many high school graduates would there be if 30 students graduated with honors?
- Target miss probability
The target is divided into three zones. The shooter's probability of hitting the first zone is 0.18, the second zone is 0.22, and the third zone is 0.44. What is the likelihood that he will miss the target? - Cube edge
Calculate the size of the cube edge if the diagonal of the wall is 8 cm. - The encore
The rock band had a 15-minute encore at their concert, which accounted for 12% of the total length of the concert. What was the total length of the concert? - The price
The calculator's price gradually decreased from 65 euros to 30 euros, then to 10 euros, and finally to 4 euros. What percentage were the individual reductions? What percentage of the original price was reduced? - Cauliflower sales
Miss Cabbage sells vegetables in the market. Yesterday, she offered two types of cauliflower - a large one for 25 CZK and a small one for 15 CZK. In the morning, she sold 8 boxes of 20 heads of cauliflower and thus earned 3,270 CZK. How many large and how - Trapezoid land price
The land on which the car service stands is shaped like a trapezoid with bases 98 m and 76 m long. The distance from the bases is 64 m. Calculate the price of the land; if 1 m² of land costs 14 €? - Worker repair time
The worker performs the repair work in 20 days, and his assistant does the job himself in 60 days. How many days would they work together?
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