I don't actually. You don't have to use math if you don’t want it, just logic.
I took the questions from the website www.iflscience.com on its article "Can you pass the world's shortest IQ test? It's just three questions long, but few can get them all right". It is quite simple but can be also a good topic for a forum if everyone says how they solved the problems.
However, thanks for the idea, I will look for my little cousins' mathematic books hahaha
You are right, even when I don't know what you do in the second step of the equation haha. However, yes, the ball cost 0.05.
Have anyone else tried another?
You are testing my mathematic skills that I used a long time ago :)
Let me try the first question:
ball + bat = 1.1
let the ball = x
x + (x + 1.0) = 1.1
2x + 1.0 - 1.0 = 1.1 - 1.0
2x = 0.1
x = 0.05
How did I do? :)