1. 25%x=20, x=80.
2. x+35%=540, x=539.65.
3. x-78%=808, x=808.78.
25%x=20
25x=2000
x=800
x+35%=540
x=540-0.35
x=539.65
x-78%=808
x=808+0.78
x=808.78
25%x=20
x = 20 × 100 / 25 = 80
x+35%x = 540
135%x = 540
x = 540 × 100 / 135 = 400
x-78%x = 88
22%x = 88
x = 88 × 100/22 = 400
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