Emily says "the lowest number that 3 and 6 both divide into exactly is 18". is emily correct?

Me with this one question, and i'll upvote the brainliest answer

Aresearch group wants to find the opinions’ of city residents on the construction of a new downtown parking garage. what is the population of the survey downtown shoppers downtown visitors downtown workers city residents

Use the elimination method to solve the systems of equations. choose the correct ordered pair. 7x+4y=39