Equal weights of two alloys containing tin, copper and lead in the ratio 7:4:5 and 5:3:8 are melted and mixed together. What is the ratio of tin, copper and lead in the resultant alloy?
Choose the correct answer:
A) 41:81:37	B) 33:91:81	C) 16:7: 12	D) 12:70: 16	E) 12:7: 16
Let the weight of the two alloys be w each   Required ratio =   (7w/16 +5w/16): ( 4w/16 +3w/16 ): (5w/16+6w/16)   = 12w/16 : 7w/16 : 11w/16   = 12:7: 16   ANSW12:7: 16R:12:7: 16
<result>E</result>
Equal weights of two alloys containing tin, copper and lead in the ratio 7:4:5 and 5:3:8 are melted and mixed together. What is the ratio of tin, copper and lead in the resultant alloy?