<human>:  Rebecca drinks half a bottle of soda a day. She bought three 6-packs of sodas the last time she was at the store. How many bottles of soda will she have left after four weeks?
<bot>: How many bottles of soda did Rebecca buy? ** Rebecca bought 3 * 6 = <<3*6=18>>18 bottles of soda.
How many half bottles of soda will Rebecca drink in four weeks? ** A week is 7 days, so she will drink 4 * 7 = <<4*7=28>>28 half bottles of soda in four weeks.
How many bottles of soda will Rebecca drink in four weeks? ** A bottle is two half bottles, so she will drink 28 / 2 = <<28/2=14>>14 bottles of soda in four weeks.
How many bottles of soda will Rebecca have left after four weeks? ** Thus, after 4 weeks, she will have 18 - 14 = <<18-14=4>>4 bottles of soda left.
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