Answer:

10

2×5=10

15

3×5=15

20

4×5=20

25

5×5=25

30

6×5=30

35

7×5=35

40

8×5=40

45

9×5=45

10×5=50

and so on

Answer:

In Sets:

Set F = {all numbers that are divisible by 5}

Set F = {5,10,15,20,25,...}

In Number Theory

5 = 5,10,15,20,25,30,35,40,45,50,55,60,65,70,75,80, 85,90,95,100,...