Question

| A and B can complete the work in 21 days. A alone
can do 1/2 the work in 15 days . In how many days can
B alone complete the work?​

Answer 1

Answer:

A and B both work in total 21 days

only A complete on half work in 15 days then B will do 21-15=6

Answer 2

Answer:

70

Step-by-step explanation

work done by A  in a day = [1/2]/15= 1/30

work done by A and B  in a day = 1/21

SO WORK DONE  by  B in a day = 1/21 -1/30

                                                         = [10 -7]/210 =3/210 = 1/70

no of days required to complete by B = 70