First get the 35% of 206.80, which is 72.38, then subtract it to 206.80 and divide it by 2, which represents the 2 sisters. You will be getting Evy's savings account, which is $67.21, then add 72.38 to it to get Lucy's savings, which is $139.59. To prove that the answer is correct: 67.21+139.59=206.80
