math,algebra

what is the difference and similarities
if solving an equation with varibles in the equation if it had 1 or 2 or even 3 variables?

Here is one:

Money left in Wallet= money earned + money found - money lost - money spent.

I don't understand? can you please explain...

asked by jasmine20
  1. Cindy spends 20% of the money that she has on groceries.

    She has a total of $30.

    How much money did she spend on groceries?

    posted by angie
  2. 20% of $30
    =30 * 1/5
    = $6

    posted by Ellie

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