A marketing firm determined that, of 200 households surveyed, 80 used neither Brand S nor Brand B soap, 60 used only Brand S soap, and for every household that used both brands of soap, 3 used only Brand B soap. How many of the 200 households surveyed used both brands of soap?
Choose the correct choice from the following
A) 15  B) 20  C) 30  D) 40  E) 45
SOLUTION FOR SOAP S AN40 SOAP B= 40=40
<result>D</result>
A marketing firm determined that, of 200 households surveyed, 80 used neither Brand S nor Brand B soap, 60 used only Brand S soap, and for every household that used both brands of soap, 3 used only Brand B soap. How many of the 200 households surveyed used both brands of soap?