Answer :

According to the question:

Volume of cistern = 150 × 120 × 110

[Volume of cube = lbh where l, b and h are length, breadth and height respectively]

= 1980000 cm3


Volume to be filled in cistern = 1980000 - 129600


= 1850400 cm3


Let n numbers of porous bricks were placed in the cistern


Volume of n bricks = n × 22.5 × 7.5 × 6.5


= 1096.875n


As each brick absorbs one-seventeenth of its volume, therefore, volume absorbed by these bricks = (1096.875)


1850400 + (1096.875) = (1096.875)n


1850400 = (1096.875)


n = 1792.41

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