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You are HERE >>  Mathematics : Algebra : Grade 9

Algebra Lesson 8 - The Equation Behind an Old Trick 
      by Elaine Ernst Schneider 
    September 13, 2000 


            To understand why the puzzle works, you must solve it algebraically.

             Let x = your house number.

             Let y = your age.

             Let A = answer 

Using the numbered list of instructions, set up the problem as an algebraic equation. It would look like this:

             A = 50(2x + 5) + y + 365 - 615 


             A = 100x + 250 + y +365 -615


             A = 100x + y


             A = x + y/100


             x = the house number (You started with this number.)

             y/100 = your age (When you divide by 100, you move the decimal point two places to     the left.)

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Submitted by:  © Elaine Ernst Schneider  is a freelance writer and a teacher. She has been writing since high school and has published articles, songs, and children's work. Presently, Elaine is a curriculum author for Group Publishing and also writes the City Songs column for ezine.  Jot a note to this Consultant


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