SAT考试9月每日精选题（51）

>>SAT考试练习：SAT考试9月每日精选题（51）

>>SAT考试辅导：精品课程高端指导

Mathematics>Standard Multiple Choice

Read the following SAT test question and then click on a button to select your answer.

0.18c+1.08t=90

In the equation above, if 90 represents the total amount of dollars spent on a purchase of c ounces of copper and t ounces of tin, what is the cost, in dollars, of 1 ounce of tin?

A.0.18

B.1.08

C.6

D.83.33

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答案：B

解析：

Choice B is correct. The price per ounce of a material multiplied by the amount of that material in ounces is the total amount, in dollars, spent on that material.

Therefore, the total amount spent on copper plus the total amount spent on tin must be $90. The cost, in dollars, of 1 ounce of tin can be interpreted by looking at the term 1.08t in the given equation. This term represents the total amount spent on tin. Thus, the price of one ounce of tin is 1.08 dollars.

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