# Math forum

 Number game Options
yolimac01
 #1 Posted : Monday, May 14, 2012 8:11:32 PM
Rank: Newbie

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Joined: 5/14/2012
Posts: 1

pick a number. add 5 to the number. next, multiply by 4. subtract 12. divide by 4. please explain this equation to me.

penhill
 #2 Posted : Tuesday, May 15, 2012 3:20:37 PM
Rank: Newbie

Groups: Registered Users

Joined: 5/15/2012
Posts: 1

This is not an equation, it's an expression.

The value of the expression is you first number added by 2. If you subtract 20 rather than 12, the value becomes your first number (x).

((x+5)*4-20)/4 => (4x+20-20)/4 => 4x/4 => x

This is an old game to fool people....

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