In an experiment, it was observed that metal A is 19 times heavier than water and metal B is 9 times heavier than water. In what ratio metal A and B mixed so that the mixture thus obtained be 15 times heavier than water?
1
2 ∶ 3
2
1 ∶ 3
3
3 ∶ 1
4
3 ∶ 2