Posted by malik on Thursday, December 11, 2008 at 7:22pm.
fill up the 4 and dump it in the 7. then fill up the 4 again and dump it in the 7. you will have 1 gallon left in the 4. then dump out the 7 and dump the 1 from the 4 in the 7. fill up the 4. 4 + 1 = 5!
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