book Maths Puzzle Numerical Ability

1. The width of a rectangle is 10 feet less than the length, find the length of each side if the perimeter is 100 feet.

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book Other Question

USING A COMBINATION OF 24% NITROGEN AND 12% NITROGEN TO ACHIEVE AN END RESULT OF 100 GRAMS OF 21% NITROGEN. I need an expression that simplifies to 1,2,3,4,or,5. The expression must also have all four opperations (addition, subtraction, Mutliplication, and division. It must also have 4 radical symbols in it.