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 KCSE Mathematics Paper 1 Revision Exercise Set 4

A rectangular sheet measuring 80 cm by 50 cm is 2 mm thick and is made of metal whose density is 2.5g/#cm^3#. A square of side 5 cm is removed from each corner of the rectangle and the remaining part folded to form an open cuboid.
a) Calculate
i. the area of metal which forms the cuboid.
ii. the mass of the empty cuboid in kilograms.
b) The cuboid is filled with water whose density is 1 g/#cm^3#. Calculate the mass of the cuboid when full of water.

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