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The ratio of zinc to copper in a certain alloy is 2 to 5. If 120 grams
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29 Jun 2021, 08:20
29 Jun 2021, 08:20
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The ratio of zinc to copper in a certain alloy is 2 to 5. If 120 grams of copper are used, how many grams of zinc are needed to make this alloy?
(A) 20
(B) 48
(C) 180
(D) 200
(E) 300
(A) 20
(B) 48
(C) 180
(D) 200
(E) 300
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Re: The ratio of zinc to copper in a certain alloy is 2 to 5. If 120 grams
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29 Jun 2021, 09:23
29 Jun 2021, 09:23
1
Carcass wrote:
The ratio of zinc to copper in a certain alloy is 2 to 5. If 120 grams of copper are used, how many grams of zinc are needed to make this alloy?
(A) 20
(B) 48
(C) 180
(D) 200
(E) 300
(A) 20
(B) 48
(C) 180
(D) 200
(E) 300
\(\frac{Z}{C} = \frac{2}{5}\)
\(C = \frac{5}{(2 + 5)}(total)\)
\(120 = \frac{5}{7}(total)\)
\(168 = total\)
Therefore, zinc =\( 168 - 120 = 48\)
Hence, option B
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Re: The ratio of zinc to copper in a certain alloy is 2 to 5. If 120 grams
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11 Nov 2021, 12:33
11 Nov 2021, 12:33
Carcass wrote:
The ratio of zinc to copper in a certain alloy is 2 to 5. If 120 grams of copper are used, how many grams of zinc are needed to make this alloy?
(A) 20
(B) 48
(C) 180
(D) 200
(E) 300
(A) 20
(B) 48
(C) 180
(D) 200
(E) 300
We can solve this question using equivalent ratios in the form: zinc/copper
So we get: x/120 = 2/5
Cross multiply: 5x = (2)(120)
Simplify: 5x = 240
Solve: x = 240/5 = 48
Answer: B
