# Example 04 | Age Related Problem in Algebra

### Question:

Question:
Why is the mathematical expression for ...when Albert is twice as old as Bryan was...
A + x = 2(B - y)
And not
A = 2(B - y) since "when Albert is" refers to the present?

### "When Albert is" refers to

"When Albert is" refers to the time when "Albert is as old as Bryan will be" (the previous statement) which is x yrs in the future. Similar interpretation for "Bryan is as old as Albert was when Bryan was half the age he will be ten years from now"