OG 2016 Tracker >>> OG2016 Problem Solving Video Solutions (OG Diagnostic)



OG 2016 Numbering:
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OG2016 PS Diagnostic #6.
A marketing firm determined that, of 200 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 households surveyed used both brands of soap?
15
20
30
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45
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