The bat and the ball

[Любитель чая]

Ask yourself the following question. A bat and ball, together, cost a total of $1.10 and the bat costs $1 more than the ball. How much is the ball?


The wrong answer is : 10 cent. The correct answer is 5 cent, since only with a bat worth $1.05 and a ball worth 5 cent are both conditions satisfied.