Jones is now twice as old as he was 5 years ago and his mother is now 4 times as Jones. How old is his mother now?

Answer 1

Let's assume Jones' current age is J.
Twice as old as he was 5 years ago is J = 2*(J-5) = 2J - 10
The equation now becomes J = 2J - 10
Simplifying the equation, we get J = 10
Jones is currently 10 years old.

His mother's age would be 4 times Jones' age, so his mother is 4 * 10 = <<4*10=40>>40 years old.
Therefore, Jones' mother is now 40 years old. Answer: \boxed{40}.