Question 810239
Those look like the third, fourth, and fifth positive multiples of 5.


-------------------------------------------------------


Side Note:


First positive multiple of 5:  1*5 = 5


Second positive multiple of 5:  2*5 = 10


Third positive multiple of 5:  3*5 = 15


Fourth positive multiple of 5:  4*5 = 20


Fifth positive multiple of 5:  5*5 = 25


And so on...