What is the fuel /oil mixture for a weedeater model GE 21, its bit old ?

Buy some type of perfect mix oil and it will not matter , I sale Opti 2 , or Perfect Mix by Tanaka.
These will cover anything from 16-1 up to 60-1.
Luck

Thanks - I already have 50:1 and 25:1 mixtures made for other tools. I just want to use one that is the correct ratio. There is no instruction manual.

What I'm saying is if you use perfect mix you will not need two or three cans just one.

Most are 40:1