Math practice for 13 year olds - page 133 of 428
Number of problems found: 8558
- Harvesters
Five combine harvesters harvest wheat in 12 days. How much will the harvest time be shortened when six combine harvesters enter the field? - Classroom commute students
In the classroom, 50% of students come from other districts. One-third of them commute by bus, a fifth by bike, and seven pupils walk. How many students are in the class? - Christmas temperature measurement
The thermometer read 2 degrees in the afternoon and -3 degrees on Christmas Day in the evening. What temperatures did the following day show when the temperature was 6 degrees lower in the afternoon and evening? - Group number average
In a given group of numbers, one number is equal to the average of all, the largest number is 7 larger than the average, the smallest is 7 smaller than the average, and most numbers in the group have below-average values. What is the smallest number of nu - Two water 2
Two water pumps can fill a water tank in 20 minutes. How many minutes will four pumps take to fill the tank at the same rate? - Pupils
Three hundred fifty pupils attend the school, of which 210 are girls. What percentage of boys attend school? - The height of prism
A right triangle forms the base of the vertical prism with perpendiculars 30 cm and 40 cm long. This prism has the same volume as a cube with an edge length of 3 dm. Find its height in cm. - Deposit interest calculation
How much € do we have to save on a three-month term deposit with an interest rate of 2.5% pa? If we want the deposit to earn an interest of € 1,100 - Bronze
Bronze is 80% copper and 20% tin. If we have 39 kg of tin, how much copper will we need to produce bronze? - Sneaker discount percentage
Igor paid only 12 euros for sneakers instead of 15 euros. What percentage did he pay less? What percentage of the original amount of sneakers became cheaper? - Five people
Five people can finish painting a wall in 4 hours if only two people are available. How many hours do they have to work to finish the same job? - Peter's rectangle
Peter had a rectangle 2 cm wide and of unknown length. The line had a 2 cm rectangle whose length was equal to the perimeter of Peter's rectangle. When they put the rectangles together with their widths, they got a new rectangle with a circumference of 63 - Jointly and cube power
If y varies jointly as x and the cube of z and y=16 when x=4 and z=2, find an equation representing this relationship. a. y=xz b. y = 2xz³ c.y = 2kx/z³ d.y = xz³/2 - Direct proportion
y varies directly as x and y=32 when x=4. Find the constant of variation. - Three men
If three men can do a job in 8 days, how many men can do the same job in 6 days? - Three dices
What is the probability that the sum of points 14 will be a roll of three dice (B, M, Z)? - Iced tea bottle
Iced tea in a bottle costs 1.20 euros. A bottle is seven times cheaper than tea. How many euros does a bottle cost, and how much tea? - How long
How long is the diagonal of the square with side a = 50mm? - Grass mix bag
The gardener has to prepare a grass mix containing clover grass and a meadow mixture at a price of CZK 24 per kilogram. A kilogram of mono-grass mixture costs CZK 22, and a kilogram of meadow mixture costs CZK 30. It will determine how many kilograms of m - Tea mixture package 1 kg of white tea costs CZK 1,800. 1 kg of green tea costs CZK 1,200. It determines how many grams of white and green tea will be contained in a package of Buddha's mixture if it weighs 50g and costs CZK 65.
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