[計量] 問一題數學from補習班模考
補習班紙本模考中的題目:
Brand R coffee costs $3.25 per pound and
Brand T coffee costs $2.50 per pound.
colA colB
----------------------------------------------
The number of pounds of brand R
in a mixture of brands R and T 1.2
that costs $ 3.00 per pound.
ANS: D
我的算法:
設買一pound混合的咖啡
3.25 x R+ 2.5 x T = 3 把T用1-R換 得:R牌佔2/3 ,T牌佔1/3
但是不懂題目要問什麼..
就算把2/3帶進去總價格算: 買一pound $3.00 ,R佔其中 $2.16
我想我誤會題目了 請各位幫忙!! 感謝!!
~希望颱風不影響航班!!
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 114.36.61.65
推
07/14 14:56, , 1F
07/14 14:56, 1F
→
07/14 14:58, , 2F
07/14 14:58, 2F
→
07/14 15:30, , 3F
07/14 15:30, 3F
推
07/14 15:37, , 4F
07/14 15:37, 4F
推
07/14 15:49, , 5F
07/14 15:49, 5F
→
07/14 16:20, , 6F
07/14 16:20, 6F
GRE 近期熱門文章
PTT職涯區 即時熱門文章