What is the ratio 18/26 expressed in simplest form?

When you simplify this, you have to divide both of these numbers with a same number. In this case, you can divide both of these by 2. By doing so, you get 9/13. You can't simplify this down any further, so that's your final answer.

╔═⋄═◇═◈═❖═✧═☆═✧═❖═◈═◇═⋄╗✧   ok, now this, is epic.╚═⋄═◇═◈═❖═✧═☆═✧═❖═◈═◇═⋄╝