### Home > ACC6 > Chapter 3 Unit 3 > Lesson CC1: 3.1.6 > Problem3-84

3-84.

Walter is mixing cement for his new patio. He knows he needs to use a water-to-cement ratio of $20$ to $30$. What percent of his total mixture is water?

• Write the ratio of water to total mixture as a fraction, then convert to a percentage.

$\frac{\text{water}}{\text{mixture}}=\frac{20}{20+30}=\frac{20}{50}=\frac{2}{5}$

$\frac{2}{5}=\frac{40}{100}=40\%$

$40\%$