The present age of the father is twice the age of his daughter. Ten years ago, the difference of their ages was 20 years find their present ages​

6. sarah saved $12.75 every week for a number of weeks, w. she received an additional $25 during the last week in which she saved money. write and solve an equation to find the number of weeks, w, for which sarah had saved money if she has $114.25 now.