Add one part of the substance you want to dilute to nine parts water.
Nine parts water plus one part substance is 10 parts.
If you add one part substance to 10 parts water, you get an 11-fold dilution.
1 ml solute to 19 mls solvent. This gives a total volume of 20 (20 fold)
10 10 10 Put a line through the second 1 to make 10 to 10. Then think time:10 minutes till 10:00 is 9:50, so the answer is 10 to 10 = 9:50
You can open a lemonade stand.
That is just 1. So just put it as a denominator as itself and that Equals one. 1/1, 2/2, 18/18, those all equal one.
Primarily your DNA and life experience. Most, if not all, other attributes spring from these two factors.