Math practice for 13 year olds - page 363 of 414
Number of problems found: 8279
- Triangular pyramid
Determine the volume and surface area of a regular triangular pyramid having a base edge a=20 cm and a lateral edge b = 35 cm. - Aquarium volume
The aquarium has a cuboid shape and dimensions a = 0.3 m, b = 0.85 m, c =?, V = ?. What volume has a body if, after dipping into the aquarium water level rises by 28 mm? - Water pool
A pool with a volume of 990 hl is completely filled if water flows from one tap for 8 hours and from a second tap for 6 hours. The first tap delivers 10 hl more per hour than the second. How many hl per hour does each tap deliver? - Principal and interest
Peter put € 270 principal into the bank, and at the end of the year, the account was € 282. To what annual interest rate did Peter deposit money in the bank? - Sales off
Goods are worth € 87, and the price of goods fell by two weeks in a row by 10%. How much percent decreased overall? - Great Wall of China
The Great Wall of China is 8880 km long. Historically valuable, however, is only 30% of its length. What amount of insurance pays the People's Republic of China a month for this monument if the insurance company charges $ 10 per year per kilometer of hist - Diamond
Calculate the length of the two diagonals of the diamond if: a = 13 cm v = 12 cm - Pages of book
Helen calculated that if she read 16 pages a day, she would finish the book a day earlier than if she read only 14 pages a day. How many pages does the book have? - Rectangle
The rectangle is 18 cm long and 10 cm wide. Determine the diameter of the circle circumscribed by it. - Basements
In the first cellar, there are more flies than spiders. In the second, the opposite. In each cellar, the flies and spiders had a combined 100 legs. Determine how many flies and spiders could have been in the first and how many could have been in the secon - Reservoir
A reservoir that is 6 m long has a diameter of 2.2 m. What is its surface area in square meters? - Bundle of candies
The store has 168 chocolates, 224 caramel candies, and 196 hard candies. How many packages can we do, and how many candies will be in each package? - Runners circle
Pepa circles the track in 36 seconds. Kamil in 42 seconds. They started together. How many seconds will we meet again at the start? - Boletus and cossacks
Paul has 8 dry boletus, 1/2 less oak boletus, 5x more cossacks than butter mushrooms. He has 3x more cossacks and butter mushrooms together than dry boletus. How many mushrooms does he have in total? And how many butter mushrooms and how many cossacks? - Rectangular triangles
The lengths of the corresponding sides of two rectangular triangles are in the ratio 2:5. At what ratio are medians relevant to hypotenuse these right triangles? At what ratio are the areas of these triangles? A smaller rectangular triangle has legs 6 and - Locomotive
Locomotive pulled a permanent train load of 200 kN horizontally along the track of 5 km. What work has it done? - Journey to grandma
Daniel traveled to Grandma. He traveled 100 km, halfway by train, one quarter by bus, one-tenth by bicycle, and the rest by car. How many km did he travel by car? - Basketball
Peter and Frank shot baskets. Each had 20 attempts. Peter scored thirteen and Frank scored twelve. Calculate each one's success rate as a percentage. - Percent chaining
Calculate 20% from 70% from 80 km - Tiles
How much will you pay CZK for laying tiles in a square room with a diagonal of 8 m if 1 m² cost CZK 420?
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