1/4 of all married couples have more than one child. 1/5 of all married couples have more than 3 children. What fraction of all married couples have 2 or 3 children? Options:
A) 1/5  B) B.1/4  C) 1/20  D) 3/5  E) It cannot be determined from the given information.
Plug in simple numbers. Take 100 couples for example.   1/4 of 100 couples have more than one child = 25 couples.   1/5 of 100 couples have more than 3 kids = 20 couples.   This implies that 20 couples are a subset of 25 couples and the complement of 25 couples within those 100 couples, which equals 75 couples have either one or no kids at all.   We need to find couples that have 2 or 3 kids, so essentially, it is  25 - 20= 
<gadget id="calculator"> 25 - 20</gadget>
<output>5</output>
5. Fraction will be 5/100= 1/20.   Option 1/20
<result>C</result>
1/4 of all married couples have more than one child. 1/5 of all married couples have more than 3 children. What fraction of all married couples have 2 or 3 children?