Working alone A can do a work in 72 days and B in 90 days. If they work on it together for 10 days, then what fraction of work is left?
Working alone A can do a work in 72 days and B in 90 days
let the total work be 360 units
so A will work at 5 units/day and B will work at 4 units/dayÂ
Together they work at 9 units per day
Now in 10 daysÂ
Work done = 90 units
Now work left = 270
Fraction = 270/360 =3/4
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