Question

if A and b together can complete a job in 15
days and B alone can complete in 20 days.
In how many days can A alone complete job​

Answer 1

60 days

A→1/20

B→ Don’t know

A+B=1/15.

Thus, 1/20+1/B=1/15. If you solve this B would get 60. ( you need to be very strong in maths by watching the equation to find out 60 for B).

So in one day B would complete 1/60th work . To complete entire work he would take 60 days.

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Answer 2

Answer:

60 days

Step-by-step explanation:

Job done together

1 + 1 = 1

a b 15

also b alone can do in 20 days,

so, 1 = 1

b 20

Now, 1/a = 1/15 - 1/20

= 4/60 - 3/60

= 1/60

So can alone can do in 60 days

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