Maths practice for 12-year-olds - page 324 of 349
Number of problems found: 6966
- Briefcase
The cost of producing a briefcase is € 45. The manufacturer wants to sell it at a profit of 30%. How much will the briefcase sell for? - Obtuse angle
Which obtuse angle is creating clocks at 17:00? - Temporary 1637
Three temporary workers will clean 60 meters of the sidewalk in 5 hours. How many meters of sidewalk will clean by seven temporary workers in 8 hours? - Remainder 1634
The work crew will excavate 1/4 of the channel on the 1st day, and 1/2 of the remainder on the 2nd day. Third day 1/3 of what she dug the second day. What part of the canal in km still needs to be dug after the third day, if the length of the canal is 72 - 7 roses
Peter bought seven roses. When he paid for them, he had 4 euros left. If he had bought five roses, he would have had 40 euros left. Thus, Peter had 40 euros before the purchase. - Reduced 1631
Three times the number reduced by 10 is as much as 100, as 100 is more than twice that. What is the number? - Unknown number 5
I think of an unknown number. If we enlarge it five times, then subtract 3, and the result decreases by 75%, we get one greater than the number. What number am I thinking? - Store
Peter paid 3 euros in-store, more than half the amount on arrival at the store. When he left the shop, he had 10 euros in his wallet. How many euros does he have upon arrival at the store? - Difference 1628
If I add the ratio, the product, the difference, and the sum of the unknown number and the number 2, I get the number 72. What is this unknown number? - Stamps and albums
Michail has stored 170 stamps in three albums. In the first album, there are 14 more than in the second, and in the second, there are 1/5 less than in the third. How many stamps are in the first album? - The classroom
In the seventh class, the number of boys and girls is at a ratio of 4:5. Boys are 16. How many total students are in the classroom? - Stairs
Between adjacent levels are 15 stairs. If the step were 1.2 cm shorter, there would be 16 stairs. What is the stair height? - Isosceles trapezoid v3
In an isosceles trapezoid ABCD is the size of the angle β = 123° Determine size of angles α, γ and δ. - Mr Novak
Mr. Novak earns an average 927 euros. When increasing the salary, they gave him a choice: ... What is a better choice for Mr. Novak? - Rope slack
Between two streets, 20 m away, give the lamp in the middle and hang 60 cm below the taut rope. Can it be done with a 20.5 meters rope? - Pizza master
Master says that he can split pizza into 16 parts by five equals straight cuts. Is it possible? - Series
Andrew wrote this series of numbers: 1,3,7,15, ...., n. Which number in the series does not belong? ... - Circumference 1608
The bases of the isosceles trapezoid measure 110m and 50m. The distance between the bases is 40m. Calculate its circumference. - Angles ratio
In an ABC triangle, is true relationship c is less than b, and b is less than a. Internal angles of the triangle are in the ratio 5:4:9. The size of the internal angle beta is: - Internal angles
One internal angle of the triangle JAR is 25 degrees. The difference is the size of the two others is 15°. Identify the size of these angles.
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