Math practice for 13 year olds - page 332 of 422

Number of problems found: 8438

Canister
Gasoline is stored in a cuboid canister having dimensions 44.5 cm, 30 cm, and 16 cm. What is the total weight of a full canister when one cubic meter of gasoline weighs 710 kg, and the weight of an empty canister is 1.5 kg?
Mother and daughter age
A mother is six times as old as her daughter. The mother will be twice as old as her daughter in twenty years. How old is the mother, and how old is the daughter?
Beetles and spiders
The collector of beetles and spiders had ten creatures in a box. There were a total of 72 legs in the box. How many beetles and how many spiders?
Goals scored
Jarda scored 18 goals more than Karel. They scored a total of 86 goals. How many goals did Jarda achieve, and how many did Karel score?
Mushrooms
Eve and Jane collected 114 mushrooms together. Eve found twice as many as Jane. How many mushrooms did each of them find?
Internal angles
Find the internal angles of the triangle ABC if the angle at the vertex C is twice the angle at B and the angle at the vertex B is 4 degrees smaller than the angle at vertex A.
Inequality with fraction
(1 + 3x) / (x-2)> 3
Cylinder:
Cylinder: calculate the height of a 3-liter cylindrical pot with a diameter of 10 cm.
Gingerbread sharing
Johnny and Mary ate 36 gingerbreads together. Johnny ate 14 more gingerbread. How many gingerbreads did Mary eat? How much did Johnny eat?
Money distribution
Adam, Boris, and Cyril have 21 CZK in total. Adam and Boris together have 11 CZK, and Boris and Cyril together have 13 CZK. How much does each of them have?
Playing match
Romania played a match against Canada. Canada won the duel by six goals. They scored a total of ten goals in the game. Find the number of goals scored by Romania.
Tournament goals
Italy, the Netherlands, and Spain scored 67 goals in the tournament. The Netherlands scored two more goals than Italy, and Spain scored one goal less than Italy. Determine the number of goals.
Book sales
The Harry Potter book was released in the second quarter, and 6,000 copies were sold in this quarter. In the third quarter, it sold 8% more and in the fourth quarter it sold 15% more than in the third quarter. How many Harry Potter books have been sold by
Percentage calculation
What is 15% of 30% of 600?
Circle radius
Calculate the circle's radius if the circumference and area are in a 2:5 ratio.
Trapezium
The area of trapezium is 35 cm². Find its height if the bases are 6 cm and 8 cm long.
Switzerland - summerjob
Susan and Hannah used to work in a cherry orchard to earn money for a sightseeing trip to Switzerland. They picked 15 trees every day and harvested the entire orchard in 10 days. How long would it take them to harvest the entire orchard if they picked 20
TV original price
The TV cost € 420 after a 9% discount. How much did he cost before the discount?
Pool
The pool is a cylinder with a diameter of 4.6 m and a presumed height of 130cm. The bucket holds 12 l of water. How many buckets do you have to bring to fill this pool?
Cube diagonals
A cube has an edge length of 5 cm. Draw its different diagonals.

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