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1. If w,x,y, and z are on-negative integers, each less than 3, and w(3^3) + x(3^2) + y(3) + z = 34, then w + z = ?
(A)0 (B)1 (C)2 (D)3 (E)4
答えはC
この場合on-negativeは誤植という気もしますが。
27w + 9x + 3y + z = 34と変形できますが、与件のon-negativeの意味が気になって解けません。
2.
Comapny X Company Y
Price $75 $530
Surcharge as a 4% 3%
percent of price
Installation $82.50 $93.00
Charge
The table above shows the various charges made by two companies for the same air conditioner. What is the total
amount tha can be saved on the purchase and installation
of the air conditioner by dealing with the company that offers the lower total charge.
(A)$41.50 (B)$45.00 (C)50.75 (D)55.75 (E)61.25
これは単純に二つのエアコンの価格の比較をするのでしょうか。しかし、それにしても同じエアコンなのに値段が違いすぎます。かつby dealing with the companyは何を意味するか理解できません。
3. The pages of a report are numbered consecutively from 1 to 10. If the sum of the page numbers up to and including page number x of the report is equal to one more than the sum of the page numbers following x, then x = ?
(A)4 (B)5 (C)6 (D)7 (E)8
答えはD
one more than the sum of the page numbers following x とは最後の数字プラスそれに続く数字プラス１と理解すべきでしょうか。 その場合 x + x + x + 1 ということか？
4. If b and c are positive numbers and 1/b = b/c = c/8, then b + c = ?
(A)4 (B)6 (C)7 (D)8 (E)9
答えはB
これはどのように計算すればいいでしょうか。
よろしくお願いします。
かっちゃん
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