"a" Adults and "k" students are trying to cross a river with a raft. However the raft can carry only 1 adult at a time, or 2 students, or 1 students. What is the minimum number of trips we need to take to bring everyone across? Express it as a general equation.

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Koala Bird has put up a difficult question. I dunno how to do.

x+2k=Answer?
Or;
x+k=Answer?
I really dunno.

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