Multiple choice general knowledge math & puzzles Divide 30 by 1/2 and add 10. What is the answer? 25 70 35 60 Reveal answer Fill a bubble to check yourself B Correct answer Explanation Dividing by 1/2 means multiplying by 2. So 30 ÷ 1/2 = 30 × 2 = 60. Then 60 + 10 = 70.