GRE Prep Club Daily Prep
Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.
Customized
for You
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
An alloy A is formed by mixing gold and silver in the ratio 2 : 1. Ano
[#permalink]
26 Oct 2021, 09:50
26 Oct 2021, 09:50
1
Expert Reply
6
Bookmarks
00:00
Question Stats:
56% (03:13) correct
43% (03:14) wrong based on 16 sessions
Hide Show timer Statistics
Alloy A is formed by mixing gold and silver in the ratio 2 : 1 by weight. Alloy B is formed by mixing silver and platinum in the ratio 3 : 4. Alloy C is obtained by mixing alloys A and B in a certain ratio such that the ratio of gold to platinum in alloy C is 5 : 6. Which of the following correctly represents the fraction of silver in alloy C?
A. 29/51
B. 37/13
C. 17/31
D. 49/126
E. 19/35
A. 29/51
B. 37/13
C. 17/31
D. 49/126
E. 19/35
Re: An alloy A is formed by mixing gold and silver in the ratio 2 : 1. Ano
[#permalink]
26 Oct 2021, 13:48
26 Oct 2021, 13:48
3
1
Bookmarks
Is this math correct? I did the following:
First, we want Alloy C to have the ratio of gold to platinum to be 5 to 6. I multiplied by 2 (this helps down the road) to get 10 gold to 12 platinum.
In Alloy A, 10 Gold will give us 5 Silver. In Alloy B, 12 Platinum will give us 9 Silver.
In total, we have 10 Gold + 5 Silver + 9 Silver + 12 Platinum = 36 in total
5+9 = 14/36 = 7/18
7/18 is the same as 49/126
First, we want Alloy C to have the ratio of gold to platinum to be 5 to 6. I multiplied by 2 (this helps down the road) to get 10 gold to 12 platinum.
In Alloy A, 10 Gold will give us 5 Silver. In Alloy B, 12 Platinum will give us 9 Silver.
In total, we have 10 Gold + 5 Silver + 9 Silver + 12 Platinum = 36 in total
5+9 = 14/36 = 7/18
7/18 is the same as 49/126
Re: An alloy A is formed by mixing gold and silver in the ratio 2 : 1. Ano
[#permalink]
21 Jul 2024, 23:56
21 Jul 2024, 23:56
Explanation please?
