a rectangular courtyard is 18m 72cm long and 13m 20cm broad. It is to be paved with square tiles of same size. Find the least possible number of tiles.

find out thier lcm and the lcm is    102960 

now find the area of yard =1872* 1320 =2471040

now  lcm / area of yard =2471040/102960=24 tiles  is answer

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we have to find hcf so HCF of 1872 cm and 1320 cm is 24 cm hence we need 1872/24 tiles on one side and 1320/24 tiles on other ie 78x55 =4290 tiles of 24 cm square each

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