Quantitative Aptitude Ques 1108

Question: The least number, that must be added to 1720, so as to obtain a perfect cube, is

Options:

A) 7

B) 8

C) 11

D) 13

Show Answer

Answer:

Correct Answer: B

Solution:

  • Given number $ =1720 $ To make it a perfect cube, first we find the nearest cube of given number $ 11^{3}=11\times 11\times 11=1331 $ $ 12^{3}=12\times 12\times 12=1728 $

$ \therefore $ It is clear that $ 1720<{{(12)}^{3}} $ Required number $ =1728-1720=8 $

$ \therefore $ 8 must be added to 1720, to make it a perfect cube.

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