Math practice for 13 year olds - page 108 of 428

Number of problems found: 8555

Swimming pool 6
We open the first pipe and, after two hours, open the second pipe without closing the first. The swimming pool will be filled with both pipes in four hours. If we open the first pipe itself, it will fill the pool 1.5 times faster than the second pipe. How
Group placement ways
I have eight groups. How could they place first, second, and third?
Three-digit number creation
How many three-digit numbers can be created from the numbers 1, 2, 3, and 4 if you can repeat them?
Balloon percentage remaining
On the first day, 25% of the balloons were sold. On the second day, 45% of the balloons were. How many percents of balloons did they have left on the third day?
Chocolate bar price
Adam and Andrej bought sweets. Adam paid € 2.9 for three chocolates and 2 bars, and Andrej paid € 4 for four chocolates and 3 bars. How much did the chocolate cost, and how much did the bar cost?
150 percent
One hundred fifty percent of what number is 15? 150% of x is 15.
Square perimeter side
The area of the square is equal to 1024 square centimeters. Calculate the perimeter of the square and the length of the side a.
Tank water height
The tank has the shape of a rotating cylinder with a base radius of 6 m reach. Water flows at a speed of 2 liters per second for 3 hours. To what height does the water in the tank?
Peter František age
Peter and František are 102 years old. František is 12 years younger than Petr. How old is Peter?
The largest 4
The largest room in the quarantine area is 45 m long and 30 m wide. The height of the room is 15 m. If the occupancy guidelines recommend at least five m³ per person, what is the maximum number of people allowed in the room?
Parallelogram perimeter construction
Assembly parallelogram ABCD: AB = 4.8cm, va = 3cm, BC = 4cm. Calculate the circuit. Make a sketch.
Rabbit price difference
Four rabbits are 15 cents cheaper than seven identical rabbits. How much do three rabbits cost?
Make loss
By selling an item 750, a trader made a 25 percent loss. How much loss did the trader make?
Number divisible range
Find the natural number between the numbers 70 and 80 divisible without the remainder 5, 3, 15, and 25.
Number ratio smaller
The two numbers are in a relatively 3:7 ratio. If the value of the larger number is 21, find a smaller number.
Number difference three
The difference of three times the two numbers is 33. The first number is 11, more significant than the second number. What is the value of the second number?
Bucket tap filling
The bucket is filled with one tap in 4 minutes and the other in 3 minutes. In how many hours will five buckets be filled with both cocks?
The circumference 3
The circumference of a cylindrical water tank is 62.8m. When it is 4/5 full of water, it holds 125.6 hectoliters. Find the depth of the tank.
Debt purchase gain
Mr. Kabat did not pay the bank debt of 10,000 euros. His debt was bought from the bank by POHLEDOVKA for 5,000 euros. What did the company POHLEDOVKA gain from this, and what did the bank gain from it?
Dolores
Dolores has some cookies and does not want to tell the exact number. Instead, she gives a riddle. First, multiply the number by 2. Then, add 2000 to the result. After dividing the answer by 2, the result is 1036. How many cookies does Dolores have?

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