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Find the minimum number of square tiles required to pave the floor of a room of 3m 25cm long and 2m 50cm broad?

  1.   144
  2.   130
     
  3.   156
  4.   168
asked in Quantitative Aptitude by (48 points) 2 4 | 82 views
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Area of floor=81250 $cm^{2}$
Area of Tile=25X25=625 $cm^{2}$
Total tiles =$\frac{81250}{625}$=130

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Why did u take

Area of Tile=25X25=625 cm2  ??

1 Answer

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Given :  3m 25cm long and 2m 50cm broad Room = 325cm and 250cm
Tile size should be of dimension which fit perfectly in room according to dimension , 
$\therefore$ HCF(325,250) = 25
$No \ of \ tiles= \frac{Area \ of \ room}{Area \ of \ tile}$
$No \ of \ tiles$ = $\frac{325*250}{25*25}$ =130

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