Puzzle 3: How Old is Dave?

Fresh and invigorated after completing his algebra homework, Dave appeared at the living room door. He held a piece of paper covered in scribbled numbers, ‘m’s, ‘d’s, and equations.

“Dad!” he announced. “Five years from now you’ll be only double my age!”

“Amazing!” Dad almost looked up from the TV, but knew he hadn’t finished.

“But five years ago, you were triple my age then!”

“I suppose in another ten years we’ll be the same age,” Dad grunted, changing channels.

How old is Dave?

Posted in St. Joseph's News.