If 14 # 2 = 80, 10 # 4 = 70 and 20 # 6 = 130, then find the value of 8 # 12.
100
The rule is \(a\#b=5(a+b)\). It yields \(5(14+2)=80,\quad5(10+4)=70,\quad5(20+6)=130\). Therefore \(8\#12=5(8+12)=100\).
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