Math practice for 13 year olds - page 44 of 428
Number of problems found: 8560
- A clock 2
A clock was set right at 6:00 AM. If it gains 3 1/2 minutes per hour, what time will it show at 6:00 PM on the same day? - Diameter 132
The base diameter of a rotating cylinder is 2 m and its surface area is 34.54 m². Calculate the base radius of the given rotating cylinder, its height and volume. - Landing strip
How long is the runway at an airport if, at an altitude of 1.2 km, the beginning of the runway is visible at a depression angle of 58° and the end at a depression angle of 27°? - Factory chimney
How tall is a factory chimney if we see its top from a distance of 60 metres at an angle of 60°? - Advantageous internet
We had long been using internet from company A at 17.49 EUR per month — after the contract period. But we switched to internet from company B at 11.39 EUR per month, with the condition that a fee of 48.38 EUR is paid in the first month, which includes the - In prima, secunda and tertia
The numbers of children in prima, secunda and tertia are in the ratio 3 : 4 : 3. In prima and tertia together there are 12 more children than in secunda. How many children are in prima? - Force gauge 2
A force gauge measured the force of a gold necklace as Fg = 0.48 N in air and Fvz = 0.45 N in water. Is it made of pure gold? - Flower - permutations
At a flower shop, there are 5 different kinds of flowers: tulips, lilies, daisies, carnations, and roses. There are also 3 different colors of vases to hold the flowers: blue, green, and pink. If one kind of flower and one color of vase to hold them are t - Checkouts
When 4 checkouts are open in a supermarket, people wait in line for an average of 12 minutes. By how much does the waiting time increase when one checkout is closed? - At Junior's
A pizzeria offers pizza with tomatoes and cheese. If a customer wishes, they may add toppings from the following options: ham, mushrooms, corn and onion, each ingredient at most once. Every pizza is made in three sizes: small, medium and large. How many d - Electrical 11
An electrical device produces 4.2 MJ of work per hour at an efficiency of 0.53 (53%). What is the power input of this device? - Goalkeeper - success rate
Calculate the success rate of a hockey goalie who saved 30 out of 32 shots at his goal during a match. - Beekeeper 2
The beekeeper has more than 190 kilos of honey and less than 200 kilos. If he divides it into 8-kilogram bottles, he rest 3 kilos. If he divides it into 7-kilogram bottles, he he rest kilos. How many kilos of honey does he have? - MDZ - theater
There are 798 men, women, and children in the theater. The number of men is twice the number of women. The number of women is twice the number of children. How many men, women, and children were there? - Deep pool - bottom
The pool is 25m long and 12m wide. In one half of the pool, the depth is the same, 1.8m, in the other half, the bottom gradually increases to a depth of 1.2m. What is the area of the entire bottom? - In the middle 2
In the middle between the unknown number and the number 30 is the number 12. Determine the unknown number. - On a job
On a job, Peter harvested 150 kg of apples, and John harvested 130 kilograms of apples. They divided the reward of 2660 CZK in proportion to the apples harvested. How much did each receive? - Path 11
A path 1.5 meters wide is to be built around the perimeter of a square plot of land with a side of 28 meters. By how much will the area of the plot be reduced? - Solve R
Solve the equation with brackets: 5×(2u-9)-8×(0.5-3u)=4×(7u-1)-3 - Branded
Branded sneakers are now selling for 2394 CZK. The seller reduced the original price by 5%. He reduced the new price by another 10%. What was the original price? How much was the total discount? How much of the original price is 21% VAT?
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