The contents of two vessels containing copper and tin in the ratio 1:2 and 2:5 are mixed in the ratio 1:4. The resulting mixture will have copper and tin in the ratio?  Choose the correct choice from the following answers.
A) 15:32	B) 21:28	C) 31:74	D) 33:37	E) 41:92
The ratio of copper and tin the new vessel= (1/3*1/5 + 2/7*4/5) : (2/3*1/5 + 5/7*4/5)   = 31/105 : 74/105 = 31:74   Answer is 31:74
<result>C</result>
The contents of two vessels containing copper and tin in the ratio 1:2 and 2:5 are mixed in the ratio 1:4. The resulting mixture will have copper and tin in the ratio?