Brain Teaser

• 9 years ago
• Posted in:Flipped Classroom, Interactive Sites
• 0
• Author: Jan
• Tags: Brain Teaser, Mathematics

Jill and James went to the same Australia Day party. Jill was three times older than James.
 
Three years later, they met on Australia Day again. This time, Jill was only twice as old as James.

How old are they both now?

Jill-             James –

Who is this mathematician?