Width of the metal sheet = 40cm

When you form a open top rectangular gutter using this metal sheet you will have a width of floor and two equal vertical wall heights.

Let;

width of floor `= y`

Vertical wall height `= x`

So we can write;

`y+x+x = 40`

`y+2x = 40`

`y...

(The entire section contains 152 words.)

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