Find the value of x. If 1 cubic cm of brass weighs 8.4 gram

A plate on square base made of brass is of length x cm and width 1 mm. the plate weighs 4725 gm. If 1 cubic cm of brass weighs 8.4 gram, then the value of x is:

  1. 72
  2. 74
  3. 75
  4. 76
Monis Rasool Professor Asked on 21st November 2015 in Maths.
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1 Answer(s)

Answer: (3) 75

Explanation:-
TA plate on square base made of brass is of length A x cm and 1 mm.
Then, the length = X cm,  wide = X cm and width = 1 mm = 0.1 cm
1 cubic cm of brass weight = 8.4 gram
Therefore, 4725 gram = 4725/8.4 cubic cm
  = 562.5 cubic cm
Then, the volume of a plate = 562.5 cubic cm X x X x 0.1
 Square of X = 562.5/0.1
 Square of X = 5625
Square root on both side,
X = 75 cm

Then, the value of X is 75 cm. 

Hence, the answer is (3) 75 cm. 

Anurag Mishra Professor Answered on 21st November 2015.
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