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Identify the target percentage of stain left.

March 28, 2026Mathematics

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Identify the target percentage of stain left.
If 50% of the stain is removed, then $100\% - 50\% = 50\%$ of the stain is left.
Locate 50% on the Y-axis (Percentage (%) of stain left).
Follow horizontally from 50% on the Y-axis to intersect the curve.
From the intersection point, follow vertically down to the X-axis (Time soaked (minutes)).
The reading on the X-axis is 3 minutes.

The correct option is C.
$\boxed{\text{C. 3 minutes}}$

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