Latest TCS Aptitude Question SOLUTION: .Leena cut small cubes of 10 cubic cms each. Which she joined to form a cube wit 10 cubes length, 5 cubes in depth and 5 cubes wide. How many more small cubes does she require to f

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.Leena cut small cubes of 10 cubic cms each. Which she joined to form a cube wit 10 cubes length, 5 cubes in depth and 5 cubes wide. How many more small cubes does she require to form a perfect cube?

Asked In TCS xyz (12 years ago)

Unsolved Read Solution (9)

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Akash bansal  (12 years ago)

The cube which will be formed would have a volume of 10*10*10=1000
Cube formed by leena 10*5*5= 250
Volume of cube still to be formed = 1000-250=750
No. of cubes required = Volume of cube still to be formed/volume of one cube
=750/10=75

Is this solution Helpfull? Yes (39) | No (4)  

Ankit  (12 years ago)

small cube = 10 cm cubic
volume of cuboid = 10*5*5=250 cm cube
perfect cube can be form of volume = 1000 cm cube (because maximum length =10,
so,for forming cube V=1000)
so volume left=1000-250=750 cm cube
v of small cube = 10 cm cube
nuber of cube more require =75

Is this solution Helpfull? Yes (10) | No (1)  

ssour  (12 years ago)

0.75 ans according to the data given in the question..otherwise question of the data r incorrect

Is this solution Helpfull? Yes (2) | No (4)  

Sachin Bhopi  (11 years ago)

cube form by leena is 10*5*5 =250 cubes of 10 cublic cm each
we can made perfect square of 7 cubes of 10cm^3 so we require 7*7*7 = 343
so leena needs 343-250 =93 cubes of 10cm^3

Is this solution Helpfull? Yes (1) | No   

shubh mehta  (10 years ago)

Total cubes = 10*5*5 = 250 cubes
In order to be a perfect cube, 10*10*10 cubes need to be used
So, 1000-250 = 750 cubes need to be used!

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surya sree  (12 years ago)

no.of cubes=volume of large cube/volume of small cubes by which they are formed
=10*5*5/10
=250

Is this solution Helpfull? Yes | No (7)  

Ankit  (12 years ago)

sorry to sat 1 thing i don't understand side of cube are equal right........
then how u guys solving this problem as i think data is not clear

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ssour  (12 years ago)

30 is the answer

Is this solution Helpfull? Yes | No (8)  

Yash Ajmera  (11 years ago)

The Q says 1 small cube is of 10 cubic cm. We do not need that data. We have 10*5*5 = 250 cubes in a formed cube by Leena. But A perfect cube can only be of 10*10*10 = 1000 cubes. So more cubes required are 1000-250 = 750.

Rest changes depend on options given.

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