arikshit makes a cuboid of plasticine of sides 7 cm, 3 cm, 7 cm. How many such cuboids will be need to form a cube?
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Given numbers = 5\times2\times5
Factors of 5 and 2 both are not in a group of three.
Therefore, the number must be multiplied by = 2\times5\times2= 20 to make it a perfect cube.
Hence he needs 20 cuboids.
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