exam Maths Puzzle Numerical Ability

Ashley,Beth, Carlos, Dick, and Elgin went shopping. EAch had a whole number of dollars to spend, and together they had $56. The absolute difference between the amounts that Ashley

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two-thirds of the diameter of a cirlce that is 9/16 across and 9/16? I need some information on the history of linear equations. Such as where it orginated, who proposed the idea and anyhting along that line.

Thank you.