# 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 [ E ]    10 days
 Answer : Option D Explanation : = ${12 \times 3} \over 4$ = 9 days