If it is assumed that 60 percent of those who receive a questionnaire by mail will respond and 210 responses are needed, what is the minimum number of questionnaires that should be mailed?	Pick:
A) 290	B) 320	C) 350	D) 380	E) 410
Let x be the minimum number of questionnaires to be mailed.   0.6x = 210   x = 350   The answer is 350.
<result>C</result>
If it is assumed that 60 percent of those who receive a questionnaire by mail will respond and 210 responses are needed, what is the minimum number of questionnaires that should be mailed?