Q: Kevin is 4 years older than Margaret.
Next year Kevin will be 2 times as old as Margaret.
How old is Kevin?
A:
Solution
Denote as Kevin's present age.
Then Margret's present age is .
Next year Kevin will be years old, and Margaret will be years old.
Since next year Kevin will be 2 times as old as Margaret, you can write the equation
.
Solve this equation by simplifying it, step by step:
(after brackets opening at the right side)
(after moving variable terms to the right and constant terms to the left)
(after combining like terms)
Thus, you got that Kevin's present age is years.
