Lamp posts are placed round a square field measuring 60 m by 60 m. The lamp posts are placed 10 m apart with a post at each corner. How many posts are needed in all?
Solution
1 side of square has
7 lamp posts – 2 corner lamp posts = 5 lamp posts.
4 sides ----- 5 lamp posts x 4 = 20 lamp posts
Total lamp posts ----- 20 lamp posts + 4 corner lampposts = 24 lamp posts
Answer: There are 24 lamp posts in all.
Friday, December 14, 2007
Anglo-Chinese School (Primary) P5 SA2 2006 Math Question (Q40)
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