The part of the paint that was left is 51/120
Remaining paint = 5/6 - 1/8
Remaining paint = 20-3/24
Amount used to paint the fence = 2/5 of 17/24
Amount used to paint the fence = 34/120 = 17/60
Amount of paint left = 5/6 - (1/8 + 17/60)
Amount of paint left = 5/6 - (49/120)
Amount of paint left = 100-49/120
Amount of paint left = 51/120
Hence the part of the paint that was left is 51/120
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