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a pipe empty a tank in 8 hour . whereas another pipe fill at the rate of 6 liter per minute . if both pipe open together than tank empty in 12 hour . find the capacity of tank??

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Please answer the following question:
A particular shade of green has 30% of yellow and 70% of blue paint by volume. How many gallons of yellow paint should be added to 70 gallons of green paint to reduce the percentage of blue paint by 10% ?

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