Sorry to bother you guys, but I have this homework question that I'm stumped on:

"You're 1.5m from a charge distribution whose size is much less than 1m. You measure an electric field strength of 282N/C. You move to a distance of 2.0m, and the field strength becomes 119N/C. What is the net charge of the distribution?"

I was trying to find out a way to calculate the charge, but I'm not sure where to go with this. All I understand is that the electric field decreases with distance?? Any help would be greatly appreciated!