The ratio of the number of chickens in Farm S to the number of chickens in Farm T was 3 : 7. There were 48 fewer chickens in Farm S than in Farm T. When 9 chickens escaped from Farm T, the farmer in Farm T bought another 15 chickens. What was the new ratio of the number of chickens in Farm S to the number of chickens in Farm T in the end? Give your answer in the simplest form.

	Farm S	Farm T
Before	3 u	7 u
Change 1		- 9
Change 2		+ 15
After	3 u	7 u + 6

Number of fewer chickens in Farm S than Farm T
= 7 u - 3 u
= 4 u

4 u = 48

1 u = 48 ÷ 4 = 12

Number of chickens in Farm S
= 3 u
= 12 x 3
= 36

Number of chickens in Farm T
= 7 u
= 12 x 7
= 84

New number of chickens in Farm T
= 7 u + 6
= 84 + 6
= 90

Farm S : Farm T
36 : 90 _{(÷ 18)}
2 : 5

Answer(s): 2 : 5