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Let x = the amount of 12% solution.

Let 40 - x = the amount of 16% solution. So we have,

(0.12)x + (0.16)(40 - x) = (0.15)(40)

(0.12)x + 6.4 - 0.16x = 6

-0.04x = 6 - 6.4

-0.04x = -0.4

x = -0.4/-0.04

x = 10

There are 10 ml of the 12% solution, which leaves 30 ml as the amount of 16% solution.

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