Three Small Sum Puzzles

Here are three small addition based puzzles.  You only need to know how to add and whether a number is odd or even to try them.  For the first one, the clues give separately the sum of the odd numbers and the sum of the even numbers in the adjacent cells.

For the second, the clues give the sum of all four numbers, followed by the total number of odds.

For the last, the sum is given only when the number of odds equals the number of evens in the adjacent cells.

Even though these puzzles are tiny, it is interesting that they aren't completely trivial.  The fact that the clues each contain two pieces of information allows us to include fewer clues, yet still arrive at only one solution.

Higher quality PDF versions for printing are given here:
Sum of Odds and Evens PDF
Sum and Odds PDF
Balanced Sum PDF