https://www.homydezign.com/math/30195306-1-1-is-what-percent-of-10-2-10-is-what-percent-of-20-3-5-is-what-percent-of-25-4-5-is/
1. 1 is what percent of 10 ? 2. 10 is what percent of 20 ? 3. 5 is what percent of 25? 4. 5 is