What does this simple rebus mean?

Solve this riddle by finding the odd one out from the rest.

Below is the sum of symbols in each row and column in the figure. Analyzing the figure, can you find out the value of the symbols?

Which city is three-fifths chick two third cat and 50% goat?

You have a square. What you have to do is cut and reassemble the square such that you create a Red Cross sign that has the same volume as that of the square.

I have branches, but no fruit, trunk or leaves. What am I?

How can you take 2 from 5 and leave 4?

You are playing a game with your friend Jack. There are digits from 1 to 9. You both will take turn erasing one digit and adding it to your score. The first one to score 15 points will win the game.

Would you want to play first or second?

PS: The sum should be exactly 15.

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

I have nine bottles of wine and one of the nine bottles is poisoned.
I need to find the poisoned bottle with two facts
(1) Poison is deadly, only a sip will cost death
(2) I have two mice to do so.

How should I do it?