Question

A city currently has 136 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 40 weeks?

Answer 1

Explanation:

Every week, the number of streetlights will increase by 3, so after 1 week the city will have 136 + 3 = 139 streetlights, after 2 weeks it will have 139 + 3 = 142 streetlights, and so on.

After 40 weeks, the city will have added 40 x 3 = 120 streetlights to the original 136 streetlights.

Therefore, the city will have a total of 136 + 120 = 256 streetlights at the end of 40 weeks.