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. solve for the percentage of blue pigment is in the mixture of the two inks. a. 45% b. 49% c. 60% d. 75%