A rectangular cistern 60 cm long, 45 cm broad contains some water. A rectangular solid measuring 35 cm by 30 cm by 9 cm is immersed under water and rests at the bottom. Find by how much the water level rises in the cistern.

Volume of displaced water=Volume of rectangular solid                                                 =l×b×h                                                 =35×30×9 cm3Let H be the water level rise in the cistern.Volume of rised water in cistern=Volume of displaced water60×45×H= 35×30×9H=35×30×960×45=3.5 cm

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