I had to register just to post this answer. It is three pours:
From the 7, pour into the 4 and 3 (leaving the 7 empty). Then pour half of the four into the 7, leaving 2 liters in the 7, 2 liters in the 4 and 3 liters in the 3.
700, 340, 043, 223
YOU CAN'T POUR HALF OF A BOWL!
Imagine you're Samuel L. Jackson or Bruce Willis in Die Hard. You're trying to diffuse a bomb, and you need an exact amount of water to trigger a scale and turn the bomb off. Pouring "half" of a bowl isn't very exact, and would likely result in you being blown to bits.
How many times does it have to be said that you can't pour half of a bowl?