唔該！幫幫忙解答我以下2個問題唔該!

xylitol25

唔係好明個問題同"答案"
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7 g0 a; g) @% @& y. O4 O2 P1. http://nz.youtube.com/watch?v=lj3iNxZ8Dww&feature=related
5 R( a# i' \  P6 {* `7 K  }/ fAimee 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?"
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/ n. [( x, S4 g! P5 D9 a2 jCaitlin 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."- H- k; W# t/ o% N/ L" W, u0 V/ V) [

8 e7 n% N# s. g9 W2. http://nz.youtube.com/watch?v=itjlj6i9XFo
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Q:"How many feet are in 2 1/2 yards?5 R& A7 \+ M3 [) w4 t5 q
A:"78"1 b6 w- {$ b/ s" {( I+ J
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WHY NOT IS 7.5? I THINK IS 3 FEETS EQUAL 1 YARD?