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Rahul makes a cuboid of plasticine of sides 3cm×3cm×5cm. How many such cuboids will he need to form a cube? |
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Answer» Step-by-step EXPLANATION: Prime factorisation (So that we can find the number to multiply to get perfect cube) so the prime factors are 3 , 3 and 5 We must have triplets in the factors.If triplets are not there we should multiply the numbers such as there is a PAIR of 3 and single 5 so one 3 is less from its triplet and pair of 5 is less from its triplet. So multiply these numbers 3*5*5=75 Therefore 75 number of cuboids are needed |
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