Acid and water are mixed in a vessel A in the ratio of 5 : 2 and in the vessel B in the ratio of 8 : 5. In what proportion should quantities be taken out from the two vessels so as to form a mixture in which the acid and water will be in the ratio of 9 : 4?
1
7 : 2
2
2 : 7
3
7 : 4
4
2 : 3