The ratios of alcohol to water in solutions A and B are 3 ∶ 5 and 9 ∶ 7, respectively. A and B are mixed in the ratio 5 ∶ 8. In 520 ml of the resulting solution, how much water (in ml) should be mixed so as to obtain a solution in which the ratio of alcohol to water is 3 ∶ 4?
1
85
2
75
3
80
4
90