Ann and betty together have $60. ann has $9 more than twice betty's amount. how much money does each have?

First and mainly keep that 9 one side,
There are 2 people involved Ann and Betty, Then divide the TOTAL AMOUNT BY THE NUMBER OF PEOPLE.
· Then it will look like $60÷2= $30 per person.
In this case everyone has equal amount of money, but the question say Ann has $9 more than Betty's. so, Ann≈ $30 +$9= $39.
                                                       Betty≈ $30-$9= $21
         Because loses money because Ann has more,                        
                                      TOTAL=Ann+Betty
                                       $60= $39+$21