The contents of two vessels containing copper and tin in the ratio 2:3 and 5:7 are mixed in the ratio 3:5. The resulting mixture will have copper and tin in the ratio?  Answers:
A) 210:283 B) 312:433 C) 178:213 D) 197:283 E) 145:256
The ratio of copper and tin the new vessel= (2/5*3/8 + 5/12*5/8) : (3/5*3/8 + 7/12*5/8)   = 197/480 : 283/480 = 197:283   Answer is 197:283
<result>D</result>
The contents of two vessels containing copper and tin in the ratio 2:3 and 5:7 are mixed in the ratio 3:5. The resulting mixture will have copper and tin in the ratio?