Mathematics for IGCSE & O level - Ratio And Proportion (Section 3 - No. 45)

A certain solution is made by mixing acid and water in the ratio 1:4. Which is/are true?

For every 1 ml of acid, 4 ml of water is used.

Acid makes up 20% of the solution

Acid makes up 25% of the solution.

Water makes up 75% of the solution.

Ratio 1:4. Total = 5. Hence Acid =1/5 = 20%, water =4/5 = 80%.