More math problems...

This one is harder than the previous one, but still do-able. And it still is high-school level maths. The previous puzzle has a solving rate of about 50%; this will have about 30%, I think. Let's see if my prediction comes true. :)

The game you can win is about strategy in wars among the stars. You need $30.01 contribution, and the giveaway will run until Monday, 6pm (GMT+1).

The usual rules apply: no hinting, no moaning, no sharing, no thinking,...

Good luck

If the questions are hard to understand (i.e. I made some translation errors, or didn't use the right term), please, let me know. I'm not used to explaining my math questions in English. :)

EDIT: I indeed made an error when I wrote the question in the puzzle. Q1 should be:
In a deck of cards there are 26 red and 26 black cards. You divide the deck into two stacks. The first stack has three times as many cards as the second one, and it also has twice as many red as black cards. How many red cards are in the second stack?