Ethan, Oliver and Clayton collected cards in the ratio of 9 : 9 : 7. After Clayton gave ⁴₅ to Ethan and Oliver, Clayton had 123 less cards than Ethan. The number of cards that Oliver had increased by 10%. How many cards did Ethan and Clayton have in the end?

	Ethan	Oliver	Clayton
Before	9 u	9 u	7 u
Change	+ 4.7 u	+ 0.9 u	- 5.6 u
After	13.7 u	9.9 u	1.4 u

Number of cards that Clayton gave to Ethan and Oliver
= ⁴₅ x 7 u
= 5.6 u

Number of cards that Oliver received from Clayton
= ¹⁰₁₀₀ x 9 u
= 0.9 u

Number of cards that Ethan received from Clayton
= 5.6 u - 0.9 u
= 4.7 u

Number of less cards that Clayton had less than Ethan
= 13.7 u - 1.4 u 
= 12.3 u

12.3 u = 123

1 u = 123 ÷ 12.3 = 10

Number of cards that Ethan and Clayton had
= 13.7 u + 1.4 u
= 15.1 u
= 15.1 x 10
= 151

Answer(s): 151