[計量] 請教3題計量
麻煩數學高手幫我解答一下，謝謝。
1. If N=(-2)^X, where X is a negative integer, M is the defference of the
greatest value of N and the least value of N.
Column A _M Column B _3/4
The answer is (C)
2.A gorcer has 400 pounds of coffee in stock, 20 percent of which is
decaffeinnated. If the grocer buys another 100 poundss of coffee of which
60 percent is decaffeinated, what percent, by weight, of the grocer's
stock of coffee is decaffeinared?
(A)28% (B)30% (C)32% (D)34% (E)40%
The answer is (D)
3. A certain cake recipe states that the cake should be baked in a pan 8
inches in diameter. If Jules wants to use the recipe to make a cake of
the same depth but 12 inches in diameter, by what factor should he
multiply the recipe ingredients?
(A)5/4 (B)9/4 (C)3/2 (D)13/9 (E)4/3
The answer is (B)
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