book Maths Puzzle Numerical Ability

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Andrew has $547 in ten-dollar, five-dollar and one-dollar bills. There were 91 bills in all, and 10 more five-dollar bills than ten-dollar bills. Ho

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book Other Question

I have an upright tank height=47" on one end and 24.7" on the other. Bottom length is 44.5", top is 44.5"and width =12". I need to know the liquid capacity/volume or the amt. of hy ok it asks me to find any real number for the following problem:

r-4 divided by 7-r