How can you find out which one is the fake one using a scale? (You may use it only one ti'me!)
2. Sarah's father has 4 daughters:
Chihi
Chocho
Chuchu
And..?
3. You have these numbers: 2 , 4 , 6 , 8.
You can use them in any way you want, but you can't use 2 numbers at the same ti'me... Example: 4*2-6*8 Is allowed , 2^2*6*8 Is not allowed.
You need to get 25.