Concentrate 1 part. Water 5 parts. I need to make a total of 1 gal. How much concentrate and how much water 5:1 do I need?

You would need 5/6 of a gallon to be water, and 1/6 of a gallon to be concentrate.

Step-by-step explanation:

Since it is a 5:1 ratio between water and concentrate, and a total of 1 gallon, you'll split the gallon into sections.

You'll split it into 6 sections, because there is 5 parts of water and 1 part on concentrate, which combined is 6 total parts.

5 of the 6 parts are water, 1 of the 6 parts are concentrate.

To Double-Check:

5/6 of a gallon (water) + 1/6 of a gallon (concentrate) = 1 Gallon