MATHS
posted by Chloe on .
matt and ruba each have one coin.
The total amount of money is less than 50p.
work out the probability that exactly one of the coins is a 10p piece.
assume that all possible coins are equally likely.

please help

what's p?
do the coins come in 1p by 1p or 10p by 10p? Not too sure about the coin system. 
the 50p is a 50p piece it says in the book it is less than 50p (money)

sorry...... no idea. I mean it could be 49p, 49.99p, 49.999999p...?
Do they come in whole numbers or what.