The sixth-graders at Cameron's school got to choose between a field trip to a museum and a field trip to a factory. 60% of the sixth-graders picked the museum. If there are 65 sixth-graders in all at Cameron's school, how many sixth-graders went on the trip to the museum?

There were 60/100 * 65 = <<60/100*65=39>>39 sixth-graders who went on the trip to the museum. Answer: \boxed{39}.