# Reducing scale

I am sizing some landscaping, and I measured everything on a 20 to 1 scale. I realized when I was done that it was at 30 to 1. How can I convert what I already have to 30 to 1. (Example, if the grass area is 22,871.6' at 20 to 1, how do you figure it out to be 30 to 1?

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