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If you want to stick with fractions, think of it this way. Total number of fifths:
Payee 1 pays five fifths, payee 2 pays three fifths. In total there are eight fifths.
Payee 2’s amount as a fraction of the total is 3/8=0.375. Multiply by 100 to make that a percentage =37.5%
Edit: wait, you were talking about the coffee, right? Maybe up your first morning pourover recipe from 60g/l to 70g/l.
Yep you’re right. The phrasing ‘3/5 as much’ threw me for a bit.