Josie has $80. addie has $60.

in how many months will they both have the same amount of money if josie saves $30 per month and addie saves $40?

__ months

Oh wow that was easy lol  in 2 months both of them will have $140

Month      1   |    2        3        4
            _|___|||                            |      
           J |  80 |   120|  150|   180
              |       |         |          |   
           A | 60  |   100|    140|   180

So four months until they have the same amount of money.