A city currently has 122 streetlights. As part of a urban renewal program, the city council has decided to install 3 additional streetlights at the end of each week for the next 52 weeks.
How many streetlights will the city have at the end of 46 weeks?
In 1 week, the city installs 3 additional streetlights.
In 46 weeks, the city will have installed 3 * 46 = <<3*46=138>>138 additional streetlights.
Therefore, at the end of 46 weeks, the city will have a total of 122 + 138 = <<122+138=260>>260 streetlights. Answer: \boxed{260}.