ibm - person a can finish 25 of work and person b can finish 35 of work if a completed 19 of his work and b completed 518 of his work then what fraction of work is not yet completed by both - skillgun

Total work is 2/5+3/5=1
so, A use to do 2/5th work ,but he has completed =2/5*1/9 = 2/45 work
B use to do 3/5th work ,but he has completed =3/5*5/18= 1/6 work
left out work = 1-(2/45 +1/6)
= 71/90