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There are in total 3 * 6 = 18 triangles.

For 2/3 of 18 triangles  to be shaded, there must be 2/3 * 18 = 12 shaded triangles to be shaded.

Since there were originally 2 shaded triangles, 12 – 2 = 10 more triangles needs to be shaded. 

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