The difference in their ages is 2 1/6
Step-by-step explanation:
When you subtract fractions, you have to make sure the denominators are the same, and you just subtract the numerator and the whole number (If there is one). In this case, the denominators are already the same, so you just subtract the numerators and whole number. 12 - 10 (whole numbers) = 2 and 7 - 5 (numerators) = 2. Therefore, the answer is 2 2/12 which simplifies to 2 1/6