20
Remember that in decimal division, the decimal point moves the same way in both numerator and denominator. 1/0.05 = 1 ÷ 0.05 = 10 ÷ 0.5. Notice that 0.5 = 1/2 is the reciprocal of 2, so that dividing by 0.5 is equal to multiplying by two. Thus, 1/0.05 = 1 ÷ 0.05 = 10 ÷ 0.5 = 10 × 2 = 20.