Problema Solution
Daniel is 3 years younger than Stephanie. Stephanie and Daniel first met 3 years ago. Thirteen years ago, Stephanie was 4 times as old as Daniel.
How old is Stephanie now?
Answer provided by our tutors
let
d = the age of Daniel now
s = the age of Stephanie now
Daniel is 3 years younger than Stephanie
d = s - 3
Thirteen years ago, Stephanie was 4 times as old as Daniel
s - 13 = 4(d - 13)
by solving the system of equations
d = s - 3
s - 13 = 4(d - 13)
we find
d = 14 years
s = 17 years
click here to see the step by step solution of the system of equations
Stephanie is 17 years old now.