(1). X, Y and Z can complete a work separately in 12, 24 and 18 days respectively. They started together but Y left after 4 days of start and X left 2 days before the completion of the work. On which day X left from the work?

• (a). 1
• (b). 2
• (c). 3
• (d). 4
• (e). 5

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