0.5=0.1/[(x-20)/20]0.5=(0.1•20)/(x-20)0.5=2/(x-20)x-20=2/0.5x-20=4x=24
0.1/0.5=(x-20)/200.2 = (x-20)/200.2*20 = x-204 = x-20x=20+4x =24
