In 25 days, the earth pick up 6*108pounds of dust from the atmosphere. How much dust it will pick up in 15 days.

  Dust picked up  in 25 days = 6× 108pounds

  So  ,  Dust picked up  in 1 day = 6×10825pounds
Therefore,Dust picked up  in 15 days = 6×10825×15 pounds = 3.6 ×107pounds

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