Step-by-step explanation: To simplify the expression 25/30 + 10/30, we first need to find a common denominator. The least common multiple of 30 and 30 is 30 itself, so we can multiply all the fractions by 30. This gives us:
(25/30)(30/30) + (10/30)(30/30) = 75/90 + 10/90
Next, we add the fractions:
75/90 + 10/90 = 85/90
Therefore, 25/30 + 10/30 = 85/90.