Question

lan can make a wall in 18 days and mick can make it in half the time taken by lan.they both start working together what part of the wall they can finish in a day

Answer 1

Lan makes a wall in 18 days.So, in one day he can make 1/18 of the wall.Similarly, Mick can do 1/9 of the wall. So, in one day if we add,
1/18+1/9=3/18.
Therefore they can complete 1/6 of the wall in one day.
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Answer 2

please see the attachment.