5/4 of all married couples have more than one child. 2/5 of all married couples have more than 3 children. What fraction of all married couples have 2 or 3 children?  Choose the correct choice.
A) 1/5	B) 1/4	C) 17/20	D) 3/5	E) It cannot be determined from the given information.
Plug in simple numbers. Take 100 couples for example.   5/4 of 100 couples have more than one child = 125 couples.   2/5 of 100 couples have more than 3 kids = 40 couples.   This implies that 40 couples are a subset of 125 couples   We need to find couples that have 2 or 3 kids, so essentially, it is  125 - 40= 
<gadget id="calculator"> 125 - 40</gadget>
<output>85</output>
85. Fraction will be 85/100= 17/20.   Option 17/20
<result>C</result>
5/4 of all married couples have more than one child. 2/5 of all married couples have more than 3 children. What fraction of all married couples have 2 or 3 children?