3) Pronounced as one letter,
And written as three,
Three letters are there,
And only two in me.
I'm doulbe, I'm single,
I'm black and gray,
I'm read from both ends,
And the same either way.

Answer: ?

6) There was a man who had a Fox, a Chicken, and a bag of Grain.

He has to cross a river to get back home, but he could only take up to one item or animal at a time with him.

He could only take the Fox, the Grain or the Chicken.

But if you leave the Chicken and the Fox on one side and take the Grain the Fox eats the Chicken.
Same thing if you take the Fox. The Chicken eats the Grain.

How does he get them all across and home safely?

Answer: C, back, F, back w/ C, G, back, C