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1. On how many parts can you split a circle with 4 lines? 2. A bottle of 1 l contains 6 dl of water. If we fill 6 dl more, how much water will the bottle contain? 3. A lion can eat a sheep in 2 , wolf in 3, and a dog in 6 hours. In what time would they all eat a sheep? 4. Are there an existing objects that you can't see with a magnifier (an image of an object)? 5. One father gave his son 150$, and the other one his son 100$. But the sum of the gifts to both sons is only 150$. How can we explain that? 6. Two passengers came to the river. There was a boat that was capable to transport only one passenger. But both passengers were transported by that boat. How can that be? 7. Which number has a property that his third is also a 1/2? 8. There are seven pieces of geometrical shapes: Squares, circles and triangles. Squares are 3 times more than the triangles. How many circles are there? 9. Take four things: Pencil (P), rubber (R), book (B) and notebook (N). On how many ways can you combine these four things? exp. 1) P,R,B,N 2) N,B,R,P ... 10. How can you measure 4 l of water with two bottles of 3 l and 5 l? 11. There are 8 pairs of shoes in the dark room. How many shoes you must take to have at least one pair? 12. Consider: Is there at least two questions that none can answer with yes, but only with no? 13. How many sides has a six side pencil? 14. All bodies are expanding when heated. Is there something that is condensing when heated? 15. There are 10 white, 7 red and 5 green balls in the box. How many balls, at least, without looking, you must take out from the box to have balls with all color? 16. A boy lied in the bed at 7 PM and wind a clock to ring at 9. How many hours did the boy slept before the clock wake him? 17. A truck is moving with a speed of 60 km/h. With what speed must the car move for every kilometer to be faster than truck for 2 minutes? 18. How can you arrange 24 balls in 6 rows so that in every row there will be 5 balls? 19. There was 6 different coffers of nail in the shop: Of 15, 16, 18, 19, 20 and 31 kg. Jack and John bought 5 coffers, and Jack bought twice more weight of nails than the John. Which coffers did they bought each? 20. Can you weight anything in the range of 1 to 31 g with weights of 1, 2, 4, 8 and 16 g if we putt weights only on the one side of the balance? |
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