The two white triangles have areas of 1/2 x 3 x 10 and 1/2 x 6 x 10 = 15 + 30 = 45 cm^2 The shaded area will be 10 x 10 - 45 = 55 cm^2 The percentage shaded = 55 / 100 x 100% = 55%
Pounds because I don't think that a sink weighs a ton and ounces would be far to complex. Plus, you are measuring the capacity of a sink...
Sorry if the answer sucks! I'm new at this and not all that smart...
