Answer: R = (-2,0) S = (-9,0)
2/3(120) = 240/3 = 80 do not drink
4/5(120) = 480/5 = 96 do not smoke
72 do not smoke or drink
96 - 72 = 24 do not smoke
80 - 72 = 8 do not drink
72 do not do either
120 - (24 + 8 + 72) = 120 - 104 = 16 drink and smoke

So the answer is 
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I used the log rules
y*log(x) = log(x^y)
log(x) + log(y) = log(x*y)
these rules apply to any log base (not just base 10).
Here ^^
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<u><em>A≈78.54</em></u>
<u>to be exact it would be 25</u>
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<em>bye have a good morning/afternoon/evening!! <3</em>
<u><em>- berry</em></u>