(1)0.15:18%=0.5:x 0.15x=18%×0.5 0.15x÷0.15=0.09÷0.15 x=0.6; (2)(x-16):3=18:1.2 (x-16)×1.2=3×18 (x-16)×1.2÷1.2=54÷1.2 x-16=45 x-16+16=45+16 x=61.