A mother and a daughter working together can complete a certain work in 4 days. But if the mother worked alone she could complete the work in 6 days. Both of them worked for one day and then the mother had to leave. How long will the daughter take to complete remaining work ?



[ A ]    7 days
[ B ]    8 days
[ C ]    6 days
[ D ]    9 days right
[ E ]    10 days
Answer : Option D
Explanation :
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= ${12 \times 3} \over 4$ = 9 days