4 boys and 6 girls get Rs. 3200 by doing a piece of work in 5 days. 3 boys and 7 girls get Rs. 3480 by doing the same work in 6 days. In how many days, 7 boys and 6 girls can complete the same work getting Rs. 7520?
1
8 days
2
4 days
3
16 days
4
10 days
5
5 days