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Question

Four cubes of volume 125 cm3 ach are joined end to end, in a row. Find the surface area and volume of the resulting cuboid (see fig).
1205249_039000ef223d4397b9f2322be6ba7107.png

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Solution

Legth of cuboid =l=20cm
breadth of cuboid =b=5cm
Height of cuboid =L=5cm
Surface area of cuboid 2(lb+bh+hl)
Surface area =2[(20×5)+(5×5)+(5×20)]=450cm2
Volume =lbh=20×5×5=500cm2

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