Q. Two alloys A and B contain gold and copper in the ratios of 2:3 and 3:7 by mass, respectively. Equal masses of alloys A and B are melted to make an alloy C. The ratio of gold to copper in alloy C is
| (A) 5:10 | (B) 7:13 | (C) 6:11 | (D) 9:13 |
Ans: 7:13
Sol:
Alloy A contains Gold and Copper.
Let 2x:3x
Which is same as 4x:6x
Alloy B contains Copper 3x:7x
As masses of Alloy A is equal to Alloy of mass B.
i.e
Gold Copper
i.e Alloy 1 4x : 6x⇒10 x (mass)
Alloy 2 3x : 7x⇒10 x (mass)
![Determine the correctness (or otherwise) of the following Assertion [A] and the Reason [R]](https://www.gkseries.com/blog/wp-content/uploads/2023/10/Determine-the-correctness-or-otherwise-of-the-following-Assertion-A-and-the-Reason-R.jpg)
