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In Question 2 above, if 1 part of a red pigment requires 75 mL of base, how much red pigment should we mix with 1800 mL of base?

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Let the parts of red pigment required to mix with 1800 mL of base be x.

The given information in the form of a table is as follows.

Parts of red pigment1x
Parts of base (in mL)751800

The parts of red pigment and the parts of base are in direct proportion.

Therefore, we obtain

Thus, 24 parts of red pigments should be mixed with 1800 mL of base.

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