Multiple choice general knowledge math & puzzles 12.8 x ? = 3.2 0.20 0.25 0.30 0.35 Reveal answer Fill a bubble to check yourself B Correct answer Explanation To find the missing value, divide 3.2 by 12.8. 3.2 / 12.8 is equivalent to 32 / 128. Simplifying the fraction 32/128 gives 1/4, which is equal to 0.25.