x-20%x=4 4x-75%=0.25 x÷四分之五=40% 20%x+30%x=120

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x-20%x=44x-75%=0.25x÷四分之五=40%20%x+30%x=120x-20%x=44x-75%=0.25x÷四分之五=40%20%x+30%x=120x-20%x=44x-75%=0

x-20%x=4 4x-75%=0.25 x÷四分之五=40% 20%x+30%x=120
x-20%x=4 4x-75%=0.25 x÷四分之五=40% 20%x+30%x=120

x-20%x=4 4x-75%=0.25 x÷四分之五=40% 20%x+30%x=120
x-20%x=4
0.8x=4
x=4÷0.8
x=5
4x-75%=0.25
4x=0.25+75%
x=1÷4
x=0.25
x÷5/4=40%
x=40%×5/4
x=1/2
20%x+30%x=120
x=120÷0.5
x=240