Question

ab kisi kaam ko 10 din m bc 12 din m ca 15 din m a akela us kaam ko kitne din m krega

Answer 1

Total work=60 units,

A+B=6 units/day,

B+C=5 units/day,

C+A=4 units/day,

then
A+B+C=7.5 units/day,

then
A=7.5-5=2.5 units/day,

therefore
total days to complete the work by A=60/2.5=24 days