3) 15/16 : 1 1/48 : 2 1/7 : 2 2/49

1. Convert mixed numbers to improper fractions: 15/16 : 49/48 : 15/7 : 102/49.

2. Convert divisions to multiplications by reciprocals: 15/16 * 48/49 * 7/15 * 49/102.

3. Simplify and multiply: (15 * 48 * 7 * 49) / (16 * 49 * 15 * 102) = (48 * 7) / (16 * 102) = (3 * 7) / 102 = 21/102 = 7/34.