Ashley is 15 years younger than jessica. if the sum of their ages is 71, how old are they
Accepted Solution
A:
The first thing we must do for this case is to define variables. We have then: x = Ashley age y = Jessica age We write the system of equations: x + y = 71 x = y-15 Solving the system we have: (y-15) + y = 71 2y - 15 = 71 y = (71 + 15) / (2) y = 43 years Then, for x we have: x = y-15 x = 43-15 x = 28 years Answer: Ashley is 28 years old. Jessica is 43 years old.