A and b can together do a piece of work in 6 days and a alone can do it in 9 days. The number of days b will take to do it alone is
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use simply ratio and proportion to solve the given problem
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A+B, complete the work= 6 days
A+B one day work =1/6 part
A alone = 9 days
A one day work =1/9 part
let B complete the work= x days
A one day work =1/x part
∴ 1/9+1/x =1/6 part
⇒1/x =1/6 - 1/9
⇒1/x =1/18
x=18 days
B will take to do it alone in 18 days ANS
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