Of the 85 house in a development, 50 have a two-car garage, 40 have an in-the-ground swimming pool, and 35 have both a two-car garage and an in-the-ground swimming pool. How many houses in the development have neither a two-car garage nor an in-the-ground swimming pool? Choices:  A) 10  B) 15  C) 20  D) 25  E) 30
Neither Car nor Garage   = Total - Garage - (Swim - Common)   = 85 - 50 - (40-35) = 85-55= 
<gadget id="calculator">85-55</gadget>
<output>30</output>
30   Answer 30
<result>E</result>
Of the 85 house in a development, 50 have a two-car garage, 40 have an in-the-ground swimming pool, and 35 have both a two-car garage and an in-the-ground swimming pool. How many houses in the development have neither a two-car garage nor an in-the-ground swimming pool?