Working together

Two people will do the work in 12 days. They worked together for eight days. Then only one worked for ten days. How many days would each of them do the work if he worked alone?

Correct answer:

x =  12 d
a =  30 d
b =  20 d

Step-by-step explanation:

12/a+12/b =1 8/a+8/b + 10/a = 1  a=30 b=20  x=12 d=12 d
a=30=30 d
b=20=20 d

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