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Question:

A mixture of paint is prepared by mixing 1 part of red pigments with 8 parts of base. If 1 part of a red pigment requires 75 mL of base, how much red pigment should we mix with 1800 mL of base?

Solution:

1 part → 75 ml base
∴ x part → 1800 ml base
So, x/1800 = 1/75
→ x = 1 × 1800 / 75
→ x = 24 ml