Ian can make a wall in 18 days and mick can make it in half time taken by ian. they start working together, what part of the wall they can finish in a day?
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4
1/6
as
1/18+1/9
1/18+2/18
3/18
1/6.
as
1/18+1/9
1/18+2/18
3/18
1/6.
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