The solution of equation x-0.75x = 100 is ()

The solution of equation x-0.75x = 100 is ()


The solution is 400
(1-0.75)x=100
0.25x=100
x=100÷0.25
x=400



(x + 120 × 10%) / (120 + x) = 20% to solve the equation


(x+120×10%)÷(120+x)=20%
(x+12)÷(120+x)=0.2
x+12=0.2(120+x)
x+12=24+0.2x
x-0.2x=24-12
0.8x=12
x=15
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