all i did was put in a point instead of a slash, then you do get 15. wrong i suppose. never any good at maths at school. only had eyes for the teacher!
I thought the answer might lie in Roman numerals or numbers in other bases but have played around for hours and can't solve it. i would be most interested to know the answer as and when it is revealed.
someone at work gave it me to solve...it was written as: Divide 20 by 1/3 to equal 1.5 I will find out the answer on Friday and put on here, if it's not on here first!