The easiest examples

  1. Three cats
    three_cats If three cats eat three mice in three minutes, after which time 210 cats eat 210 mice?
  2. Chocolate
    cokolada Leslie bought 8 same chocolates for 16 Eur. How many euros will he pay for 25 chocolates?
  3. Divisibility
    divisibility Is the number 761082 exactly divisible by 9? (the result is the integer and/or remainder is zero)
  4. Inflation
    dollar What is better for people (employees)? ?
  5. One half
    one_half One half of ? is: ?
  6. Brick
    brick One brick is 6 kg and half a brick heavy. What is the weight of one brick?
  7. Family
    bigfamily The parents had 7 daughters. Each of them had one brother. How many members family had?
  8. Cyclist
    cyclist_2 A cyclist passes 88 km in 4 hours. How many kilometers he pass in 8 hours?
  9. Balls
    balls I have 19 balls and my friend has 27. About how many has my friend more balls?
  10. Orchard
    orchard 9 trees in 2 lines grows in the orchard. How many trees are in the orchard?
  11. Proof PT
    pytagoras Can you easy prove Pythagoras theorem using Euclidean theorems? If so, do it.
  12. Holidays
    holidays Calculate how many hours take holidays, if take 7 weeks.
  13. Ton's teeth
    teeth Calculate at what age homeless Anton will toothless. At age 29 has 26 teeth and each year next one tooth broke.
  14. Reverse Pythagorean theorem
    pytagors 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 ?
  15. 7 heroes
    7statocnych 9 heroes galloping on 9 horses behind. How many ways can sort them behind?
  16. Vans
    shuttlevan In how many ways can 9 shuttle vans line up at the airport?
  17. Is right?
    rtriangle Is triangle with sides 51, 56 and 77 right triangle?
  18. Compare
    fraction Compare fractions ?. Which fraction of the lower?
  19. Laws
    pyt_triangle From which law follows directly the validity of Pythagoras' theorem in the right triangle? ?
  20. Root
    root_quadrat The root of the equation ? is: ?

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