Answer
25.6 million females 18 years old and older are widowed or divorced.
91.8 million females 18 years old and older are married, widowed, or divorced.
Work Step by Step
Set $A$ is the females 18 years old and older who are married, set $B$ is the females 18 years old and older who are widowed, and set $C$ is the females 18 years old and older who are divorced.
The first question asks for the union of sets $B$ and $C$
Using the Counting Formula for sets:
$n(B\cup C)=n(B)+n(C)-n(B\cap C)$
According to the survey, there isn't anybody who is both widowed and divorced; therefore, $n(B\cap C)=0$
$n(B\cup C)=11.2+14.4-0=25.6$
25.6 million females 18 years old and older are widowed or divorced.
The second question asks for the union of sets $A$, $B$, and $C$.
Using the Counting Formula for sets:
$n(A\cup B\cup C)=n(A)+n(B+n(C)-n(A\cap B)-n(B\cap C)-n(A\cap C)+n(A\cap B\cap C)$
According to the survey there isn't anybody who is in either intersection of these sets; therefore:
$n(A\cup B\cup C)=n(A)+n(B+n(C)-n(A\cap B)-n(B\cap C)-n(A\cap C)+n(A\cap B\cap C)=66.2+11.2+14.4-0-0-0+0=91.8$
91.8 million females 18 years old and older are married, widowed, or divorced.
