In a group of Houses,40 had dogs,30 had cats and 10 houses having both dogs and cats. what is the number of houses?
Choose the correct choice from the following choices
A) 30 B) 60 C) 40 D) 45 E) 50
Make a Venn diagram, and enter your data.   Let the number of houses be x   30+10+20=x   x = 60   so number of houses were = 60   Answer 60
<result>B</result>
In a group of Houses,40 had dogs,30 had cats and 10 houses having both dogs and cats. what is the number of houses?