Question

Parikshit makes a cuboid of plasticine of sides 5 cm, 2 cm, 5 cm. How many such
cuboids will he need to form a cube?
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Answer 1

Answer:

Given numbers = 5×2×5

Since, Factors of 5 and 2 both are not in group of three.

Therefore, the number must be multiplied by 2×5×2  = 20 to make it a perfect cube.

Hence he needs 20 cuboids.

Answer 2

Answers

given that parikshit makes a cuboids of sides 5cm,2cm,5cm

Now we have to find LCM of the sides of cuboids to get the sides of cube

then, LCM: 5,2,5=10.

therefore, the sides of cube is 10cm

Now, the volume of the cuboid is :5×2×5 cubic cm

and, the volume of the new cune is :10×10×10 cubic cm

therefore he need 1000/50=20cubiods