Answer:

13 2/3

Step-by-step explanation:

Step 1 Subtract the numerators

11/15 - 1/15 = 10/15

Step 2 Subtract the Whole Number

25 - 12 = 13

Step 3 Simplify the fraction

10/15 ÷ 3/3 = 2/3

Step 4 Finalize

13 2/3