HelloOriginally Posted by Arbitur
to 14. 5 students don't have any specific signs, that leaves you with 40 student who could be tall or haired or both. The sum of 28+19 = 47. That means there are 7 students who are tall and haired. Than there are 28-7=21 who are haired but midgets and 19-7=12 who are tall (but bold).
I've attached a Venn diagram (for further information you may look at Euler diagram) to demonstrate the result.
Next problem will follow (I haven't much time now)