120
Remember that in decimal division, the decimal point moves the same way in both numerator and denominator. 3 ÷ 0.025 = 30 ÷ 0.25. Notice that 0.25 = 1/4 is the reciprocal of 4, so dividing by this is the same as multiplying by 4. Thus, 3 ÷ 0.025 = 30 ÷ 0.25 = 30 × 4 = 120