Question 1024367
let y = the daughter's present
:
A mother is 20 years older then her daughter.
:
 A. If the daughter is y years old, how old is the mother.
 y + 20
 In terms of y, how old was the daughter is 4 years ago?
 y - 4
 In terms of y how old was the mother 4 years ago
y + 20 - 4
y + 16
 and four years ago the ratio of their ages was 7:3
{{{(y+16)/(y-4)}}} = {{{7/3}}}
cross multiply
7(y-4) = 3(y + 16) 
7y - 28 = 3y + 48
7y - 3y = 48 + 28
4y = 76
y = 76/4
y = 19 is daughters present age
then
19 + 20 = 39 is mom's age 
:
  find the percentage of the daughter.
{{{19/39}}} * 100 = 48.7%