Assume that there are four people in a group, and the 1 group has11× 4 = 44 people, which is 52-44=8 people less.

Change the group of four into a group of six, and change a group into 6-4=2.

There are 8÷2=4 groups in the six-person group and 1 1-4=7 groups in the four-person group.