[計量] Brand R coffee costs $3.25 per ...
(1) brand R coffee costs $3.25 per pound and
brand T coffee costs $2.50 per pound.
The number of pounds of
brand R in a mixture of 1.2
brands R and T that costs
$3.00 per pound.
ans:D (不能比)
為什麼不能比啊 不是可以設要求r 佔x 然後
3.25x+2.5(1-x)=3 求x 就可以算了嗎??
(2) 比大小
The value of the unis' The value of the units'
digit in 6的47次方 digit in 5的77次方
ans: A
這題是完全不會…囧
(3) For all numbers r and s, where s不等於0
r *(外面有圓圈框起來) s = s分之10r
比大小：
(0.01) *(外面有圓圈框起來) (0.01) 1
ans: A
那個「*(外面有圓圈框起來)」 是什麼意思啊???
(4) Worker W produces n units in 5 hours. Workers V and W,
working independently but at the same time, produce n units
in 2 hours. How long would it take V alone to produce n units?
a. 1hr 26min
b. 1hr 53min
c. 2hr 30min
d. 3hr 20min
e. 3hr 30min
ans: d
這種題目從國中就沒輒到現在還是死… orz
感激不盡感盡不盡啊!!!! <(_ _)>
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