Every staff in an office owns either a Mercedes and/or a Toyota car. 20 own Mercedes, 15 own Toyota and 5 own both. How many staff are there in the office?
A
25
B
30
C
35
D
45
Verified Correct Answer: B.
Step-by-Step Mathematical Solution
M = Mercedez; T = Toyota
Number of staff = 0 + (20 - 5) + (15 - 5) + 5
0 + 15 + 10 + 5 = 30
Source: Myschool Past Questions Archive (Record #36427)