RRB Group D 22-Oct-2018 Shift 2 Solved Paper

Out of 60 customers, 10 chose service 1 and 2, 15 chose service 2 and 3 and 5 chose service 1 and 3, 15 chose only service 2. 20 chose service 1, 35 chose service 2, and 30 chose service 3.  How many chose all the three services?