ISEE Mathematics Achievement Question 25: Answer and Explanation
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Question: 25
11. Aluminum bronze consists of copper and aluminum, usually in the ratio of 10:1 by weight. If an object made of this alloy weighs 77 pounds, how many pounds of aluminum does it contain
- A. 7
- B. 7.7
- C. 10
- D. 70
Correct Answer: A
Explanation:
The correct answer is (A). Copper and aluminum in the ratio of 10:1 means 10 parts copper to 1 part aluminum.
Let x = weight of aluminum
Then 10x = weight of copper
10x + x = 77
11x = 77
x = 7