40%x+180=4／5x 40%x+180=4／5x

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40%x+180=4／5x40%x+180=4／5x40%x+180=4／5x40%x+180=4／5x40%x+180=4／5x40%x+180=4／5x0.4x+180=0.8x0.4x=180x

40%x+180=4／5x 40%x+180=4／5x
40%x+180=4／5x
40%x+180=4／5x

40%x+180=4／5x 40%x+180=4／5x
0.4x+180=0.8x
0.4x=180
x=450