Four milliliters of ink A is added to 10 milliliters of ink B, forming a mixture of inks. Ink A contains 10% blue pigment. Ink B contains an unknown percentage of blue pigment. The mixture of the two inks contains 35% blue pigment.What percentage of blue pigment is in ink B?

The 14-milliliter mixture contains 35% blue pigment, so it has 14 × 0.35 = 4.9 milliliters of pigment. Ink A contributes 4 × 0.10 = 0.4 milliliters, leaving 4.5 milliliters from ink B. Since ink B has a volume of 10 milliliters, its pigment percentage is 4.5 ÷ 10 = 45%, which is choice A.

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