Question 954455
a=her age
a=3(a+3yr)-3(a-3yr)
a=3a+9yr-3a+9yr
a=18 yrs ANSWER: She is 18 years old
CHECK:
a=3(a+3yr)-3(a-3yr)
18yrs=3(18yrs+3yr)-3(18yrs-3yr)
18yrs=3(21yrs)-3(15yrs)
18yrs=63yrs-45yrs
18yrs=18yrs