6) A marketing firm determined that , of 180 households surveyed, 80 used neither Brand A nor Brand B soap.60 used only Brand A soap and for every household that used both brands of soap, 3 used only brand B soap.how many of the 200 household surveyed used both brands of soap?	Pick one.
A) a) 15  B) b) 20  C) c) 30  D) d) 10  E) e) 45
100 = At least one of Soap A or B   Both brands = x   Brand B = 3x   =&gt; 60 + x + 3x = 100   =&gt; 4x = 40   =&gt; x = 10   Answer - d) 10
<result>D</result>
6) A marketing firm determined that , of 180 households surveyed, 80 used neither Brand A nor Brand B soap.60 used only Brand A soap and for every household that used both brands of soap, 3 used only brand B soap.how many of the 200 household surveyed used both brands of soap?