Using the least common denominator technique: 2/7 = 18/63. 5/9 = 35/63. 18/63 + 35/63 = 53/63. Because 53 is prime, this fraction cannot be reduced further.
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(2/7) of (5/9) of (3/8) of 168 = 10
The sum of 5/9 and 2/9 is 7/9.
25/9 + 32/9 = 2 + 3 + 5/9 + 2/9 = 5 + 7/9
5 ninths
5/7 ; five sevenths