[計量] 在官網上找到的題目?
我剛在官網上看到有練習題
把每一個section都分出來
大概都有十幾題的practices
我在做計量部份時，有兩題想要PO來請教一下
1.In a certain year, Minnesota produced 2/3 and Michigan produced 1/6
of all the iron ore produced in the United States. If all the other
states combined produced 18 million tons that year, how many million
tons did Minnesota produce that year?
a)27 b)36 c)54 d)72 e)162
answer is d
2.The cost, in dollars, of manufacturing x refrigerators is 9,000 + 400x.
The amount received when selling these x refrigerators is 500x dollars.
What is the least number of refrigerators that must be manufactured and
sold so that the amount received is at least equal to the
manufacturing cost?
a)10 b)18 c)45 d)90 e)100
answer is d
這題是我是這樣寫9000+4x=500X
然後我把選用代入
如果符合就是正解(這是正確做法嗎?)
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