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This is very simple math that can be solved using basic algebra. Also, these problems can be solved with a little logic and some basic arithmetic. I worked them all in my head without any difficulty at all. This, however, is not trivia it is just math and math is NOT trivia.
I appreciate the answers being provided.
52 yrs since HS for me - getting a challenge taking the calculus sequence I never took at a local college. Keeping the grey matter fit. Never stop learning! BTW - up the difficulty level next time :P