I think the difficulty should be controlled a bit more.
I found that a good strategy was to guess at the harder questions so that I had more time to find easy ones, which doesn't seem right.
I'd suggest easing people into the game, starting with amounts like 100g that are easy to convert, and then stepping up the difficulty for every few correct answers they give, rather than leaving it to chance.
Why did the vector cross the road?
It wanted to be normal.
Basically I am lazy at attempting problems, this one was interesting. On any day I'd settle for the Metric.
It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.
Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.
Thanks guys ... will try to have a graduated approach.
... to guess at the harder questions ...
But each wrong answer is -2.
"The physicists defer only to mathematicians, and the mathematicians defer only to God ..." - Leon M. Lederman