Fill 3L bottleEmpty it into 5L bottleFill 3L bottle againFill 5L...

  1. 4,911 Posts.
    lightbulb Created with Sketch. 286
    Fill 3L bottle
    Empty it into 5L bottle
    Fill 3L bottle again
    Fill 5L bottle, leaving 1L in 3L bottle
    Empty 5L bottle into drain
    Pour the 1L into the 5L bottle
    Fill 3L bottle
    Add the 3L to the 1L already in 5L bottle

    Lots of ways.
 
arrow-down-2 Created with Sketch. arrow-down-2 Created with Sketch.