Two sisters open savings accounts with $60 each that their grandmother gave them. The first sister adds $20 each month to her account. The second sister adds 540 every two months to her $60. if the sisters continue to make deposits at the same rate, when will they have the same amount of money? The girls start with the same amount...after how many months will they have the same amount again? Will there be a pattern as to when they have the same amount?