`\frac{3}{5.7} + \frac{3}{7.9} + ... + \frac{3}{95.97}`
`= \frac{3}{2} ( \frac{2}{5.7} + \frac{2}{7.9} + ... + \frac{2}{95.97} )`
`= \frac{3}{2} ( \frac{1}{5} - \frac{1}{7} + \frac{1}{7} - \frac{1}{9} + ... + \frac{1}{95} - \frac{1}{97} )`
`= \frac{3}{2} ( \frac{1}{5} - \frac{1}{97} )`
`= \frac{3}{2} . \frac{92}{485}`
`= \frac{276}{970} = frac{138}{485}`