Answers

2015-05-10T16:05:06+05:30
Let  Length= 6x
       Breadth= 5x
      Height= 3x
    Total surface area= 504cm sq.
   2(lb+bh+lh) = 504
   2{6x*5x+5x*3x+6x*3x} = 504
   2[30x+15x+18x] = 504
   2[63x]  =  504
   63x =  504/2
   63x  =  252
     x=  252/63  =  4
   so, x = 4
length = 6*4 = 24
breadth = 5*4 = 20
height = 3*4 = 12
   Volume of cubiod = lbh = 24*20*12 = 5760 cubic cm

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2015-05-10T18:15:02+05:30
Total surface Area of a Cuboid  = 2 (lb+bh+lh) 
Here Length L = 6x
Breadth B  = 5x
Height H = 3x

TSA =  2 ( 6x*5x + 5x*3x + 6x*3x) = 504 cm^2
  2(63x^2)  = 504
  x^2 =  504/2 *63
  x^2  = 4     Therefore, x=2

Volume of the cuboid =  lbh  = 12*10*6  = 720cm^3 



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