Explain how you can mentally determine whether there is a remainder when 18,450 is divided by 6

I’m stuck on this i don’t understand.

Asap (explain how you got it as well for brainliest)i tried 1: 2 and 2: 3 and they were wrong.picture of figure: in the figure below, the segment is parallel to one side of the triangle. the ratio of 12 to y is1: 21: 31: 42: 3

What is the solution to the system of equations? (–2, –8) (–1, –5) (0, –2) (2, 4)