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26 December, 10:50

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?

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  1. 26 December, 11:19
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    (4*0.1+10x) / 14=0.35

    0.4+10x=4.9

    10x=4.5

    x=0.45

    The B ink is 45% blue.
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