Math practice for 13 year olds - page 104 of 421

Number of problems found: 8410

Tablecloth 72254
The table top is 1.2 m long, 55 cm wide, and 35 mm thick. Calculate how many regular meters of a 1 m wide roll are needed for a tablecloth that extends 15 cm beyond the bottom edge of the table on all sides.
Circular 72244
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?
Establish 72234
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
Groups 72194
I have eight groups. How could they place first, second, and third?
Three-digit 72184
How many three-digit numbers can be created from the numbers 1, 2, 3, and 4 if you can repeat them?
Balloons 72174
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?
Chocolates 72154
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.
Centimeters 72134
The area of the square is equal to 1024 square centimeters. Calculate the perimeter of the square and the length of the side a.
Cylinder 72094
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?
František 72084
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 72044
Assembly parallelogram ABCD: AB = 4.8cm, va = 3cm, BC = 4cm. Calculate the circuit. Make a sketch.
Identical 72024
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?
Divisible 72004
Find the natural number between the numbers 70 and 80 divisible without the remainder 5, 3, 15, and 25.
Relatively 71994
The two numbers are in a relatively 3:7 ratio. If the value of the larger number is 21, find a smaller number.
Significant 71974
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?
Buckets 71944
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?

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