In two alloys P and Q, the ratio of iron to copper is 4 : 13 and 6 : 11 respectively. 15 kg of alloy P and 20 kg of the alloy Q are mixed together to form a new alloy. What will be the ratio of iron and copper in the new alloy?
1
36 : 83
2
37 : 85
3
85 : 36
4
65 : 66
5
None of these