Question

Please Help!! At a seminar, 2/5 of the audience were students. 3/10 of them were retirees. The rest were professionals. There were 18 more students than professionals. How many people were in the audience?

Answer 1

2/5 =4/10
Professional = 10/10- 4/10-3/10=3/10
4/10-3/10=1/10
1 unit = 18
10 units =180