Re: [計量] In a class of 120 students, 60 ...
※ 引述《joannepu1110 (花花兒)》之銘言：
: BB 第591頁
: 26.In a class of 120 students, 60 percent can speak French and the rest can
: speak only English. If 25 percent of those in the class who can speak French
: can also speak English, how many of the students in the class can speak
: English?
: A:66
120*0.4+120*0.6*1/4 = 66
: 還有第29題 但是圖不會畫 如果好心人會的話 麻煩直接跟我說如何算就好!!!
: 30.The positive quantities X,Y and Z vaty over time, and 2x/3 always equals
: 16yz. If y is tripled and z is halved, then x is
: A:increased by 50%
2x/3=16yz
2x'/3=16y'z'=16(3y)(z/2)=24yz
=>x'=3/2x
: BB第619頁
: 9.On a 50-question multiple-choice test, 3 points weregiven for each question
: answered correctl and 1 point was deducted for each question answered
: incorrectly. A student who answered all of questions on the test received a
: total of 98 points.
: A column
: The number of questions on the test that the student answered
: incorrectly
: B column
: 14
3(50-x)-x=98
x=13
: 還有第623頁的24題及25題
: 24題我怎麼算都是(D) 1070000
: 因為用41.7-17.4=24.3 再用4415000X0.243=.... 不是這樣算嗎
: 還有25題的三個選項都看無
: 麻煩好心人了 謝謝^^
我沒BB...@_@
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※ 編輯: berrylover 來自: 61.224.32.69 (10/23 23:42)
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