AcadaFamilyMania Riddles

Greetings all!

Here are your 4:14pm riddles for AcadaFamilyMania:

1. How many times can you subtract 6 from 30? [5]
2. Write eight figure 3's, so that they total 34. [10] (You can include basic mathematical symbols, but nothing too advanced is required.)
3. A boy who is four feet tall puts a nail into a tree at his exact height. He returns two years later when he has grown by eight inches and the tree has grown by twelve inches. How much taller is the nail than the boy? [10]
4. Two missiles speed directly toward each other, one at 9,000 miles per hour and the other at 21,000 miles per hour. They start 1,317 miles apart. Calculate how far apart they are one minute before they collide. (This question does not require a pencil or paper... except for writing down your answer of course.) [10]
5. In a children's cartoon, a UFO alien told people that "1 minus 180 equals 21". The alien hadn't yet mastered earthly numbers, but his equation does make sense, all the same. Can you explain why? [15]

Remember to submit these answers along with your other items and I'll see you in the Main Lounge at 5:14pm!

~Matt