Question

The length of each side of an equilateral triangle is increased by 5 inches, so, the perimeter is now 60 inches. How do you write and solve an equation to find the original length of each side of the equilateral triangle?

Answer 1

I found:`15"in"`

Explanation:

Let us call the original lengths `x`:

Increasing of `5"in"` will give us:
`(x+5)+(x+5)+(x+5)=60`
`3(x+5)=60`
rearranging:
`x+5=60/3`
`x+5=20`
`x=20-5`
`x=15"in"`