Question

Direction : A survey is conducted on people about their modes of investment. Following are the results of the survey:1) Total number of people= 800 (say x).2) No of people who invested in shares= 63.75% of x.3)No of people who invested only in shares= 31.25% of x.4) No of people who invested in real estate= 31.25% of x.5)No of people who invested only in real estate= 7.5% of x.6)No of people who invested in fixed deposits= 55% of x.7)No of people who invested only in fixed deposits= 22.5% of x.8)No of people who invested all in three= 11.25% of x.Based on this information answer the question
Q 1: how many of them invests only in shares. its ans is 250 tell me how?