self Company Numerical Ability

A and B can finish a piece of work in 12 and 18 days respectively. After some days when both start to work together A leaves and B completes the remaining work in6 days. How many days has A worked together before he left?

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let x be the days they worked together then
x*(1/12+1/18)+6*1/18=1
ans x=4.8 days
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