Posted by 6th grader on .
a survey of 50 people in Nj, 10 of them know the mayor's name in their neighboring city. Out of 5,500 residents how many would you predict know the name of the mayor of the neighboring city?

math 
PsyDAG,
10/50 = x/5500
Solve for x. Multiply both sides by 5500, then divide both sides by 50.