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Peter bought a carpet 36dm wide and 60dm long. The figure shows part of this carpet. As seen, the carpet has a small squares contianing either a sun or a moon. You can count that along the width there are nine squares. When the carpet is fully unrolled, how many moons will be seen?  [Insert pic] 
Overseas Competition->Knowledge Point->Counting Modules->Counting the Number of Figures->Classifying and Enumerating->Counting Figures Formed by Grid Points
Each small square is 36/9 = 4 dm on a side. there are 60/4 = 15 squares along the length.  Both dimensions, 15 and 9, are odd. Also the corners are suns, so there is one more sun than there are moons.  Thus, there are a total of (15 x 9 - 1)/2 = 67 moons in the carpet when fully rolled. 