Question

If it cost $200 to stain a desk measuring 4m by 5m, what would it cost to stain a desk 5m by 7m?

Answer 1

`$350`

Explanation:

`"the cost is dependent on the area of the surface"`

`rArr"area "=4xx5=20" m"^2" and "5xx7=35" m"^2`

`"using "color(blue)"proportion"`

`20" m"^2to$200`

`35" m"^2to$200xx35/20=$350`