Q15:
Which of the following fractions has a decimal equivalent that is a terminating decimal?
A. 10/189 B.15/196
Answer:E =>請問有比較快速的解法嗎?
Q28:
This year Henry will save a certain amount of his income, and he will spend the rest. Next year Henry will have no income, but for each dollar that he saves this year, he will have 1 + r dollars available to spend. In terms of r, what fraction of his income should Henry save this year so that next year the amount he was available to spend will be equal to half the amount that he spends this year?
A. 1/(r+2)
Answer: E =>怎麼列式的呢?
Q22:
The number of defects in the first five cars to come through a new production line are 9, 7, 10, 4, and 6, respectively. If the sixth car through the production line has either 3, 7, or 12 defects, for which of theses values does the mean number of defects per car for the first six cars equal the median?
I. 3 II. 7 III. 12
A.I only B.II only C.III only D. I and III only E. I, II, and III
Answer: D=>我覺得答案是C
第一题，因为128 是2的6次方嘛。。。所以不管怎么除都会有个头滴
第二题，我是设他last year save 1, last year spend= 2(1+r
then, answer=1/(1+2+2r)
第三题，就一个一个列出来，它要mean =median
3,4,6,7,9,10 mean=median=6.5
2,6,7,7,9,10 median=7,mean 不等哦
4，6，7，9，10，12 mean=median=8
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