Solve 15 2/7 + 23 3/4 + 7 5/7 + 5 1/4

First, we need to find a common denominator for all fractions. The denominators are 7, 4, 7, and 4. The least common multiple of these is 28.

Now, let’s convert each mixed number to an improper fraction and then to an equivalent fraction with denominator 28:

Now we can add these fractions:

Simplify this fraction: