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Fisherman takes 15 days to knit
Fisherman will knit part of net in 1 day = 1/15
Boy takes 12 days to knit
Boy will knit part of net in 1 day = 1/12
Together they will knit net in 1 day = 1/15 + 1/12 = (4+5) / 60 = 9/60
They worked together for 5 days,
So, part of net they knit in 5 days will be = 5 * 9/60 = 45/60 = 3/4
Part remaining = 1 - 3/4 = 1/4
Boy can knit whole net alone in 12 days
Boy will knit 1/4 part of net in = 12/4 days = 3 days
Boy will knit the remaining part alone in 3 days.