For items 5&6, refer to the given problem in the box.

If Nancy checks every 4th table and Joseph checks every fifth table,
which table will be the first that they both inspect?

5. Which of the following mathematical processes will be used to solve the problem?
A) factoring
C) finding multiples
B) divisibility rule
D) addition

6. What is the right answer to the problem above?
A) 10
B) 20
C) 30
D) 40​