Entry no. 7

19. If a boy and a half can eat a hot dog and a half in a minute and a half, how many hot dogs can six boys eat in six minutes?

20. Reason why 304140932017133780436126081660
64768844377641568960512078291027000 (treat as one number) cannot possibly be the value of 50 factorial, without actually performing the calculation.

21. If you can buy eight eggs for 26 cents, how many can you buy for a cent and a quarter?

Good Luck!
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ANSWERS:
13. You have to do it with a camera, not a hairdryier.
14.One pound of feathers is more than one pound of gold because the "pound" unit is different. The most commonly used system of weights in the US and Great Britain is the avoirdupois system, where 1 pound = 16 ounces. This is used for most solid objects, except for precious metals and gems; gold is weighed by a special system, called the troy system, where one troy pound = 12 troy ounces. Where one avoirdupois ounce is 28.35 grams, one troy ounce is about 31.10 grams. To convert from avoirdupois pounds to troy pounds, multiply the first by 1.2152 to get its equivalent in troy measurement. Therefore, one "pound" of feathers in troy weight is actually 1.2152 pounds (one avoirdupois pound), compared to one troy pound of gold. And the feathers win.
15. Nothing. Really, 9.(9) equals exactly 10.