A rectangular courtyard 3.78 m lang and 5.25 m broad is to be paved exactly with square tiles, all of the same size. The minimum number of such tiles is:  Choose the correct answer.
A) 425	B) 430	C) 440	D) 450	E) 460
l = 378 Cm and b = 525 Cm   Maximum length of a square tile   = HCF of (378,525) = 21 Cm   Number of tiles = (378×525)/(21×21) = (18×25) = 450   Answer is 450.
<result>D</result>
A rectangular courtyard 3.78 m lang and 5.25 m broad is to be paved exactly with square tiles, all of the same size. The minimum number of such tiles is: