Math practice for 13 year olds - page 295 of 422

Number of problems found: 8425

Needed 5373
The box is shaped like a cube with an edge 52 cm long. How many m² of sheet metal is needed to make a box with a lid? Add 5% to the folds of the lid and walls.
Percentage 5371
There are 32 pupils in the class. A quarter of them attend a computer course. What percentage of the total number of students in the class do not attend a computer course?
Improvements 5370
After technical improvements, the radio receiver, whose price was 220 €, was auctioned for 20%. He was later reduced by 15% of the new price. What was its final price?
Calf
The weight of the calf meat obtained is 65% of the total weight of live calves. What was the weight of a calf from which 285 kg of meat was obtained?
Contributed 5368
In a specific Czech company, each employee pays 40% of the lunch price, and the remaining CZK 33 is contributed by the employer. What is the cost of lunch?
Reading book
Susan read a 250-page book. On the first day, she read 20% of the book. On the second day, half of the remaining pages. How many pages of the book has it unread?
Increase 5366
I think the number. If I increase it by 25%, I get the number 100. What number do I think?
Original price
The shop reduced the car to 85% of the original price. It now costs € 6,375. How many euros was the original price higher?
Highway repair
The highway repair was planned for 15 days. However, it was reduced by 30%. How many days did the repair of the highway last?
Identical 5362
120 hl of water flows out of the tank through 4 pipes in 16 hours. How much water flows through 5 identical pipes in 14 hours?
Image reduction
To say that I am mathematically challenged is a gross understatement! I'm trying to help my friend determine how to calculate percentages of reduction or enlargement for a quilt pattern. She is creating a drawing of a cute picture that will become a piece
Sportswear 5358
They reduced the winter jacket in the sportswear store by 24% and another 15% from the new price, so it cost 3876 kc. How much did the winter jacket cost before the first discount?
One million
Write the million number (1000000) using only nine numbers and algebraic operations plus, minus, times, divided, powers, and squares. Find at least three different solutions.
Motorcycle 5354
The diameter of the motorcycle wheel is 60 cm. How many times does the wheel turn on a track 1,884 km long?
Obtained 5353
About 50% of the pulp is obtained from wood and about 65% from paper. How many tons of paper can we make from 150 tons of wood?
Rhombus-shaped 5348
The fence around the garden is made of rhombus-shaped laths with a side 30 cm long and 1.6 m high. How many square meters of boards are needed to make a fence of 300 laths?
Interior designer
To make draperies, an interior designer needs 11 1/4 yards of material for the den and 8 1/2 yards for the living room. If material comes only in 20-yard bolts, how much will be left over after completing both draperies?
Difference 5344
the product of the sum and difference of the numbers -2.3 and 4.7
Alcohol mixture
Three liters of 96 percent alcohol set up a certain amount of distilled water to form 54 percent alcohol. How many liters of distilled water were used?
Points on line segment
Points P and Q belong to segment AB. If AB=a, AP = 2PQ = 2QB, find the distance between point A and the midpoint of segment QB.

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