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#21




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So, number of blue sides is 2*3*2+2*4*2+2*3*4, and the number of white sides is all the interior sides when you break it up, or 6*2*3*+4*2*4+2*3*4, calculate both of those and.. Actually, you just need the first number, because the total faces of the broken up cubies is 6*2*3*4, so the first number divided by that. (If I did the set up right, those should give the same answer, of course.) 
#22




2. 72.5 degrees.
3. 52/24 = Surface Area / Volume, for all onecolored instances and cubes of size 1. Each Blue surface area is of size 1, and the number of blue surface areas of size 1 equals the Total Surface Area. The number of cubes of size 1 is equal to the volume. But yes, you might be asked how you come up with the answer to the questions. Lastly, these are not "brain teasers.""Brain teasers," per se, would not require pencil and paper. I did these two with pencil and paper as they are mediumlevel math problems.
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#23




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#26




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#27




Because the answer to anything is 42. But they got hungry so they ate the grapes.
42 + 8 = 50 Q.E.D.
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#28




At first, there is 96 pounds (96% of 100 pounds) of water and 4 pounds of notwater.
After shrinkage, there is an unknown amount of water (92% of X pounds) and 4 pounds of non water, the sum of which is X pounds. So, 0.92X + 4 = X. Solve for X.
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#29




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