Question: In a survey of 190 manufacturing companies, 103 hired operators, 67 hired technicians, and 49 hired both operators and technicians, as illustrated in the Venn diagram below:

How many companies sureveyed hired at least one category of employees: operators and technicians?
(a) 130

(b) 121

(c) 49

(d) 67

(e) 93

Answer:

49 companies hired both operators and technicians.

103 - 49 = 54 companies hired operators only.

67 - 49 = 18 companies hired technicians only.

The number of companies sureveyed that hired at least one category of employees is 49 + 54 + 18 = 121.

Question: In which year did the Company A's revenues increase the most from the year before?

(a) 1971

(b) 1972

(c) 1973

(d) 1974

(e) 1977

Answer:

The slope of the line between 1972 and 1973 is higher than all of the other slopes, so the Company A's revenues increased the most from 1972 to 1973.