Discussion
One can is completely filled and contains 100% water. Another similar can is completely filled with a solution of 50% wine and 50% water. When both the cans are emptied in a steel vessel, what will be ratio of water to wine in the vessel?
Answer: D
Take each can as 1 unit.
\[ \text{Can 1: water } 1, \text{ wine } 0 \]
\[ \text{Can 2: water } 0.5, \text{ wine } 0.5 \]
\[ \text{total water} = 1.5, \qquad \text{total wine} = 0.5 \]
\[ \text{water} : \text{wine} = 1.5 : 0.5 = 3 : 1 \]
The cans are the same size, which is what lets them be counted as equal units.
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