To compare the quantities in Column A and Column B, we need to use the given equation: a/2 + b/6 = c/3 + d/9. First, we find a common denominator for the fractions to combine them appropriately. The common denominator for 2, 6, 3, and 9 is 18. Rewriting the equation with this common denominator, we get: 9a/18 + 3b/18 = 6c/18 + 2d/18. By simplifying, this becomes: 9a + 3b = 6c + 2d. Since 9a + 3b = 6c + 2d, and the fractions have been adjusted to a common denominator, the quantities must be equal. Therefore, the quantities in Column A and Column B are equal.