The most viewed math problems - page 4

1. It is rectangular? Size of two of the angles in a triangle are: α=110°, β=40°. Is it a right triangle?
2. Trio 56 children lined up in groups of three. How many children did not create a trio?
3. Playing cards How many possible ways are to shuffle 7 playing cards?
4. Promile Calculate the 4.6 ‰ of 199.
5. Pediatrician Pediatrician this month of 20 working days takes 4 days holidays. What is the probability that on Monday will be at work?
6. Root The root of the equation ? is: ?
7. Reverse Pythagorean theorem Given are lengths of the sides of the triangles. Decide which one is rectangular: Δ ABC: 77 dm, 85 dm, 36 dm ? Δ DEF: 55 dm, 82 dm, 61 dm ? Δ GHI: 24 mm, 25 mm, 7 mm ? Δ JKL: 32 dm, 51 dm, 82 dm ? Δ MNO: 51 dm, 45 dm, 24 dm ?
8. Circle chord What is the length d of the chord circle of diameter 36 m, if the distance from the center circle is 16 m?
9. Similarity Are two right triangles similar to each other if the first one has a acute angle 70° and second one has acute angle 20°?
10. Railways Railways climb 7.4 ‰. Calculate the height difference between two points on the railway distant 3539 meters.
11. Lentilka Lentilka made 31 pancakes. 8 don't fill with anything, 14 pancakes filled with strawberry jam, 16 filled with cream cheese. a) How many Lentilka did strawberry-cream cheese pancakes? Maksik ate 4 of strawberry-cream cheese and all pure strawberry pancake
12. Apples Hanka has 6 apples more than Juro and 7 apples less than Mirka. Mirka has 23 apples. How many apples has Hanka and how many Juro?
13. Tractors Fields go plow two tractors with various performance. The first tractor plow whole field in 11 hours, the second tractor plow whole field 19 hours longer. How long take plow whole field with two tractors?
14. Chickens and rabbits In the yard were chickens and rabbits. Together they had 54 heads and 118 legs. How many chickens and how many rabbits was in the yard?
15. Plums In the bowl are plums. How many would be there if we can divide it equally among 8, 10 and 11 children?
16. Cube diagonal Determine length of the cube diagonal with edge 75 mm.
17. Laws From which law follows directly the validity of Pythagoras' theorem in the right triangle? ?
18. Rectangular cuboid The rectangular cuboid has a surface area 5334 cm2, its dimensions are in the ratio 2:4:5. Find the volume of this rectangular cuboid.
19. Triangle Can be rectangular triangle equilateral?
20. Pool The swimming pool is 10 m wide and 8 m long and 153 cm deep. How many hectoliters of water is in it, if the water is 30 cm below its upper edge?

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