You got all but three right...
1.) Sorry, wrong. The answer is:Fourteen. By spelling out the name of each number, each word has one more letter than the one before it.<
3.) I should be more specific...they have five children together. Of those, half are boys. How? The answer: They're all boys.<
12.) Wrong. The answer:They never will. Every second cycle their right feet will match up, but never their left.<