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Sandra colored 1/3 of her picture black, as shown. what percent of her picture did she color white

User Stackular
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Assuming that the remaining part of the picture is white, 2/3 of the picture is white.

The painting as a whole = 1. 1 - 1/3 (the amount that is black) = 2/3. Thus, 2/3 is white.
User Inkblot
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