Question
The ratio of the number of ducks in Farm C to the number of ducks in Farm D was 4 : 9. There were 40 fewer ducks in Farm C than in Farm D. When 10 ducks escaped from Farm D, the farmer in Farm D bought another 16 ducks. What was the new ratio of the number of ducks in Farm C to the number of ducks in Farm D in the end? Give your answer in the simplest form.
4 m

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The ratio of the number of ducks in Farm C to the number of ducks in Farm D was 4 : 9. There were 40 fewer ducks in Farm C than in Farm D. When 10 ducks escaped from Farm D, the farmer in Farm D bought another 16 ducks. What was the new ratio of the number of ducks in Farm C to the number of ducks in Farm D in the end? Give your answer in the simplest form.