Question

hii mates,....

solve the question which one is attached

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Answer 1

Answer:

Length = 15cm

Breadth = 12cm

Height = 9cm

Step-by-step explanation:

=> Total surface area of the cuboid = $846 cm^2$

=> Ratio of length(l) , breadth(b) and height(h) = 5 : 4 : 3

=> Let the length, breadth and height be 5x, 4x and 3x respectively.

=> Total Surface Area = 2(lb + bh + hl)

=> $846 cm^2 = 2( 5x*4x + 4x*3x + 3x*5x)$

=> $846/2 cm^2 = 20x^2 + 12x^2 + 15x^2$

=> $423 cm^2 = 47x^2$

=> $423/47 cm^2 = x^2$

=> $x^2 = 9cm^2$

=> x = 3cm.

Length = 5x = 5*3 = 15cm

Breadth = 4x = 4*3 = 12cm

Height = 3x = 3*3 = 9cm

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Answer 2

Step-by-step explanation:

Length = 15cm

Breadth = 12cm

Height = 9cm

Step-by-step explanation:

=> Total surface area of the cuboid = 846 cm^2846cm²

=> Ratio of length(l) , breadth(b) and height(h) = 5 : 4 : 3

=> Let the length, breadth and height be 5x, 4x and 3x respectively.

=> Total Surface Area = 2(lb + bh + hl)

=> 846 cm² = 2( 5x*4x + 4x*3x + 3x*5x)

=> 846/2 cm² = 20x² + 12x² + 15x²

= 423cm² =47x²

=> 423/47 cm² = x²

=> x² = 9cm²

x=3cm

Length = 5x = 5*3 = 15cm

Breadth = 4x = 4*3 = 12cm

Height = 3x = 3*3 = 9cm