(20%x+16)/(x+16)=25%(过程)

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(20%x+16)/(x+16)=25%(过程)(20%x+16)/(x+16)=25%(过程)(20%x+16)/(x+16)=25%(过程)两边同乘以(x+16)得,0.2X+16=0.25X+4

(20%x+16)/(x+16)=25%(过程)
(20%x+16)/(x+16)=25%(过程)

(20%x+16)/(x+16)=25%(过程)
两边同乘以(x+16) 得,0.2X+16=0.25X+4
移项后得0.05X=12
X=240