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A rectangular courtyard 3.78m long and 5.25m broad is to be paved exactly with square tiles, all of the same size the minimum number of such tiles is
  1. 440
  2. 430
  3. 21
  4. none of these
Explanation

21

Solution
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Correct option is B)

Breadth of a rectangular courtyard 

Length of a rectangular courtyard 

Now, we have to find H.C.F os  and 

Common factore
   

Hence largest size of square tiles that can be paved exactly with square tiles is 

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