Question

dupe's age and olu's add upto 25 years. Eight years ago , dupe was twice as old as olu. how old are they now?​

Answer 1

Dupe's present age = 14 years

Olu's present age = 11 years

Explanation:

• Let Dupe's age be x. Let Olu's age be y. Since their ages add up to 25 years, x + y = 25
• Eight years ago Dupe's age was double that of Olu's age. Solving by simultaneous equations. Four methods are Elimination Method, Graphical Method, Substitution Method, and    Matrix Method. Let us try out Elimination method for solving a pair of simultaneous linear equations that reduces one equation to one that has only a single variable. Once this has been done, the solution is the same as that for when one line was vertical or parallel.
• Therefore, eight years ago, Dupe's age was 6 and Olu's age was 3 so that x=2y becomes, 6=2*3. Eight years hence, x=6+8=14 and y=3+8=11. That makes, x or Dupe's age as 14 years and y or Olu's age as 11 years.