Correct option (b) 24 days
Explanation:
According to question,
Since we know, efficiency of persons will remain same.
So we will balance it.
Now we can see, B’s efficiency is 3 units and C’s is 4 units and total is 12 units.
So A’s efficiency is 12 – 4 – 3 = 5 units
Total work = 10days × 12units
A can complete separately in