3x+3/1(100-x)=100

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3x+3/1(100-x)=1003x+3/1(100-x)=1003x+3/1(100-x)=1003x+1/3(100-x)=1001/3表示3分之19x+100-x=3008x=200x=25

3x+3/1(100-x)=100
3x+3/1(100-x)=100

3x+3/1(100-x)=100
3x+1/3(100-x)=100 1/3表示3分之1
9x+100-x=300
8x=200
x=25

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