1. A 3cm thick iron open box is made whose external dimensions are 78cmX54cmX12cm. find the weight of the box if its density is 60gm/cm^3
2. two cubes with sides 6cm are placed one above the other forming a cuboid. find the total surface area of the cuboid thus formed.
3. Find the curved surface area and the total surface area of the cone whose height is 28cm and diameter is 42cm.
4. How much ice-cream can be put into a cone with base radius 3.5 cm and height 12 cm ?
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