Question

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

Answer 1

It would be 20% because they asked for  water to cement ratio of 20-30 and since they asked for water and water comes before cement then you pick the first number and that is 20 and all you do is turn it into a percent which is 20%