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A piece of work can be completed by 10 men and 6 women in 18 days. men works 9 hrs a day and women 7.5 hrs a day. per hour efficiency of a woman is 2/3rd of a man's efficiency.in how many days 10 men and 9 women complete the work?

Let a, b, c and d be four numbers each of 3 digits. Then, abcd is a 12 digit number. a. Further, a + c > b + d and |a + c- b+d|=235. What is the remainder when abcd is divided by 7?

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In a tank of capacity 400 liters, half filled with milk initially, one inlet pipe and one outlet pipe are operating. In the first hour, only the outlet pipe is operating and it takes out 20 liters of the mixture. In the next hour, the outlet pipe is closed and the inlet pipe pours in 30 liters of water. In the next hour the inlet pipe is closed and outlet pipe takes out 20 liters of the mixture and again in the next hour outlet pipe is closed and the inlet pipe pours in 30 liters of water. This process is repeated for another 4 hours. What is the approximate final quantity of water in the tank after 8 hours?

1) 105 liters
2) 149 liters
3) 91 liters
4) 141 liters