唔該！幫幫忙解答我以下2個問題唔該!

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唔係好明個問題同"答案"
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. R' Y' W% r! ~3 x" F* S1. http://nz.youtube.com/watch?v=lj3iNxZ8Dww&feature=related
7 C4 @! c$ C* }9 V9 `" F; C/ YAimee Teegarden: "Recent polls have shown a fifth of Americans can't locate the U.S. on a world map. Why do you think this is?"3 m; t! q$ ?- H/ H$ h
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( s: V! ?. z) d" [; s  mCaitlin Upton: "I personally believe that U.S. Americans are unable to do so because, uh, some, people out there in our nation don't have maps and, uh, I believe that our, uh, education like such as, uh, South Africa and, uh, the Iraq, everywhere like such as, and, I believe that they should, our education over here in the U.S. should help the U.S., uh, or, uh, should help South Africa and should help the Iraq and the filter-074 countries, so we will be able to build up our future, for our children."( [9 X. ^  l8 E
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2. http://nz.youtube.com/watch?v=itjlj6i9XFo3 ~# D% {! M6 H" l4 C# Y

' s6 Q1 Y1 ]* O; SQ:"How many feet are in 2 1/2 yards?2 [+ ^6 x- V9 K1 C# w3 B! \% @0 ~
A:"78"; o# p  _% \7 U( F8 p6 O" B
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WHY NOT IS 7.5? I THINK IS 3 FEETS EQUAL 1 YARD?