Abi made buns for sale. 55% of the buns were lotus paste buns and the rest were kaya and curry buns in the ratio 4 : 1. If a customer bought 65% of the lotus paste buns and all of the curry buns, what percentage of the kaya buns must Abi sell for her to maintain the original percentage of lotus paste buns at first? Leave your answer in decimals and correct to 1 decimal place.

Lotus paste buns	Kaya buns	Curry buns
11 u	9 u
	7.2 u	1.8 u

	Lotus paste buns	Kaya buns	Curry buns	Total buns
Before	11 u	7.2 u	1.8 u	20 u
Change	- 7.15 u	- 4.05 u	- 1.8 u
After	3.85 u	3.15 u	0	7 u

55% = ⁵⁵₁₀₀ = ¹¹₂₀
65% = ⁶⁵₁₀₀ = ¹³₂₀

Total number of buns = 20 u

Number of kaya and curry buns
= 20 u - 11 u
= 9 u

Number of kaya buns at first
= ⁴₅ x 9 u
= 7.2 u

Number of curry buns at first
= 9 u - 7.2 u
= 1.8 u

Number of lotus paste buns sold
= 65% x 11 u
= ⁶⁵₁₀₀ x 11 u
= ¹³₂₀ x 11 u
= 7.15 u

Number of curry buns sold
= ¹₅ x 9 u
= 1.8 u

Number of lotus paste buns left 
= 11 u - 7.15 u
= 3.85 u

To maintain the percentage of the lotus paste buns in the end, 
55% → 3.85 u
100% → ^3.85₅₅ x 100 = 7 u

Total number of buns in the end to maintain the original percentage of lotus paste buns = 7 u

Number of kaya buns left
= 7 u - 3.85 u
= 3.15 u

Number of kaya buns that Abi must sell to maintain the original percentage of lotus paste buns
= 7.2 u - 3.15 u
= 4.05 u

Percentage of the kaya buns that Abi must sell
= ^4.05_7.2 x 100%
= 56.3%

Answer(s): 56.3%