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Category Archives: Problem solved flyers

Problem solved flyer No. 52

. Answer: Turn both sand-glasses. After 4 minutes turn upside down the 4-min sand-glass. When the 7-min sand-glass spills the last grain, turn the 7-min upside down. Then you have 1 minute in the 4-min sand-glass left and after spilling everything, in the 7-min sand-glass there will be 1 minute of sand down (already spilt). Turn the 7-min sand-glass upside down and let the …

Problem solved flyer No. 49

. Answer:  I have 4 cages and 3 canaries .