I need to know the equation for The staff commute to work in different ways 2/5 drive, 4/15 catch the bus and 1/3 cycle order the fractions starting with the largest

I need to know the equation/formula for working it out.

The staff commute to work in different ways 2/5 drive, 4/15 catch the bus and 1/3 cycle order the fractions starting with the largest

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