6. A vessel contains 12 liters of wine and another contains 4 liters of water. 3 liters are taken from each and transferred to the other. Then again 8 liters are taken from each vessel and transferred to the other. Ratio of wine to water in the two vessels-
(a) the first vessel is higher
(b) the second vessel is higher
(c) both is the same
(d) None of these
7. A milk vendor purchases 33 liters of milk containing milk and water in the ratio 12:1. He wants to make this an 11:2 solution of milk and water and sell the entire quantity at the cost price. How much water needs to be added?
(a) 3 liters
(b) 31/11 liters
(c) 2.5 liters
(d) None of these
8. Ankur has 73 liters of wine in a drum. He replaces 3.65 liters of it with water and keeps doing so till the time the concentration of wine is less than 85%. The minimum number of operations that Ankur has to perform is?
(a) 3
(b) 4
(c) 2
(d) None of these
9. Five liters are drawn from a cask full of wine and it is then filled with water. Five liters of the mixture are drawn and the cask is again filled with water. The quantity of wine now left in the cask to that of the water in it is in the ratio 361 : 39. How much does the cask hold?
(a) 400 liters
(b) 250 liters
(c) 100 liters
(d) 75 liters
10. An alloy of zinc, tin and copper contains 90% of copper, 7% of zinc and 3% of tin. A second alloy of copper and tin only is melted with the first, and the mixture contains 85% of copper, 5% of zinc and 10% of tin. Find the percentage of tin in the second alloy.
(a) 27.5%
(b) 55%
(c) 22.5%
(d) 45%