The ratio of the number of chickens in Farm P to the number of chickens in Farm Q was 4 : 7. There were 42 more chickens in Farm Q than in Farm P. When 10 chickens escaped from Farm Q, the farmer in Farm Q bought another 20 chickens. What was the new ratio of the number of chickens in Farm P to the number of chickens in Farm Q in the end? Give your answer in the simplest form.

	Farm P	Farm Q
Before	4 u	7 u
Change 1		- 10
Change 2		+ 20
After	4 u	7 u + 10

Number of more chickens in Farm Q than Farm P
= 7 u - 4 u
= 3 u

3 u = 42

1 u = 42 ÷ 3 = 14

Number of chickens in Farm P
= 4 u
= 14 x 4
= 56

Number of chickens in Farm Q
= 7 u
= 14 x 7
= 98

New number of chickens in Farm Q
= 7 u + 10
= 98 + 10
= 108

Farm P : Farm Q
56 : 108 _{(÷ 4)}
14 : 27

Answer(s): 14 : 27