Question 490379
fill 9qt pail


fill 4qt pail from 9qt pail, leaving 5qt in 9qt pail


empty 4qt pail and refill from 9qt pail, leaving 1qt in 9qt pail


empty 4qt pail and then empty 9qt pail into 4 qt pail, leaving 1qt in 4qt pail


fill 9qt pail and then fill 4qt pail from 9qt pail; this takes 3qt, leaving 6qt in the 9qt pail