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Parimal and his sister together can paint the walls of their house in 54 days. If only Parimal does this work, he would have taken 81 days. If both started the work of painting together, but Parimal's sister left 9 days before the completion of the work, then how many days did both of them take to paint their house?

Parimal and his sister together can paint the walls of their house in 54 days. If only Parimal does this work, he would have taken 81 days. If both started the work of painting together, but Parimal's sister left 9 days before the completion of the work, then how many days did both of them take to paint their house? Correct Answer 57

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