Question

The whole surface of a rectangular block is 846cm2

Find its dimension if they proportional
to 5:4:3​

Answer 1

Let the dimensions be 5x,4x, and 3x.

Total surface area =2(lb+bh+hl)

=2(5x×4x+4x×3x+3x×5x)cm^2

=94x^2cm^2

Now,

94x^2 =846cm^2 (given)

⇒x^2 =9 or x=3cm

∴ Volume of the block =5x×4x×3x

=60x^3

=1620cm^3

Step-by-step explanation:

Pls mark as brainliest