Math practice for 13 year olds - page 110 of 415

Number of problems found: 8286

Circular grass seed
How many kg of grass seed must be bought to start a lawn in the shape of a circular section with a radius of r= 15 m and a central angle of 45 degrees if 1 g of grass seed is used per 1 dm of the square area?
Fountain grass seed
How many kg of grass seed should be bought to establish a lawn around a circular fountain with a diameter of 5 m if the lawn is to be 1.5 m wide and 1 g of grass seed is used per 1 dm of the square area?
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 Francis are 102 years old. Francis is 12 years younger than Peter. 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 = 4.8 cm, va = 3 cm, BC = 4 cm. 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 between three times each of two numbers is 33. The first number is 11 more than the second number. What is the value of the second number?
Bucket tap filling
A bucket is filled by one tap in 4 minutes and by another tap in 3 minutes. How many minutes will it take to fill 5 buckets if both taps run simultaneously?
The circumference 3
The circumference of a cylindrical water tank is 62.8 m. When it is 4/5 full of water, it holds 125.6 hectoliters. Find the depth of the tank.

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