Because there are no more or less three columns, circle the multiples of 3;
Because the five elements are short of two people, choose the number that is divided by five and left with three from the numbers on the circle, and then mark it;
Because there are four people missing in row 7, we choose the numbers divided by 7 and 3 from the marked numbers. There should be only one.
A: * * * Yes 108.
Although the method is rough, please adopt it.