In a survey, 75% of respondents said that they watch TV for one hour each day. If 30 respondents said they watch TV for one hour each day, how many respondents took the survey in total?
A
70
Let X be the total number of respondents.
In a survey, 75/100*X = 30 respondents said they watch TV for one hour each day.
Multiplying both sides of the equation by 100/75 gives X = (30*100)/75 = 40. Answer: \boxed{40}.