Equal weights of two alloys containing tin, copper and lead in the ratio 5:2:7 and 8:11:9 are melted and mixed together. What is the ratio of tin, copper and lead in the resultant alloy?  Choose the most appropriate option:
A) 35:81:45	B) 33:91:81	C) 17:28:27	D) 18:15: 23	E) 20:15: 22
Let the weight of the two alloys be w each   Required ratio =   (5w/14 +8w/28): ( 2w/14+11w/28 ): (7w/14+9w/28)   = 18w/28 : 15w/28 : 23w/28   =18:15: 23   ANSWER:18:15: 23
<result>D</result>
Equal weights of two alloys containing tin, copper and lead in the ratio 5:2:7 and 8:11:9 are melted and mixed together. What is the ratio of tin, copper and lead in the resultant alloy?