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How many ions are in a 1.02 mol sample of BaCl2? How much is in a roll of Quarters, dimes, nickels? What are the four mendelian principle? How do I do 5x+3y=16 3x-5y=-4 I need x and y? The average ( arithmetic mean) of 5 numbers is 14. If one of the numbers is 20, what is the average of the other 4 numbers?