3. (8 points) Four pirates, Jack, Jimmy, Tom, and Sang, share 280 gold coins. Jack says: "I get 11 fewer coins than Jimmy, 15 more coins than Tom, and 20 fewer coins than Sang." So, Sang gets $\qquad$ coins.
【Solution】Solution: Let Jack get $x$ gold coins, so $x+(x+11)+(x-15)+(x+20)=280$, solving for $x$ gives $x=66$,

Therefore, Sangji gets $66+20=86$ gold coins. Another solution: This problem tests the concept of sum and difference, by converting through the relationship with Jack: Jack's number of gold coins is: (280 $-11+15-20) \div 4=66$ (coins)

Sangji's number of gold coins is: $66+20=86$ (coins)
The answer is 86.