Fish fed during night is equal to 1/6 tons
Let the weight of the fish fed at night = X tons
In the morning, the weight of the fish fed Wm = 2/15 tons.
In the afternoon, 1/15 ton more fish fed during the morning.
∴ Weight of fish fed in afternoon Wa
= 2/15 + 1/15
= 3/15 tons
Given that,
Wm + Wa + Wn = 1/2 tons
∴ 2/15 + 3/15 + Wn = 1/2
∴Wn = 1/2 - 5/15
∴ Wn = 3/6 - 2/6
∴ Wn = 1/6 tons
Fish fed during night = 1/6 tons.
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