Iron is 9 times as heavy as Copper and Zinc is 23 times as heavy as Copper. What should be the ratio of Iron and Zinc in the new mixture to get a mixture which must be 13 times as heavy as Copper?
1
4 : 3
2
5 : 2
3
7 : 5
4
1 : 3
5
3 : 5
Iron is 9 times as heavy as Copper and Zinc is 23 times as heavy as Copper. What should be the ratio of Iron and Zinc in the new mixture to get a mixture which must be 13 times as heavy as Copper?