86. 1 catty of oranges and 2 catty of pears cost 8.9 yuan, 2 catty of apples and 3 catty of pears cost 23 yuan, 3 catty of apples and 4 catty of oranges cost 30.1 yuan. Therefore, 1 catty of oranges $\qquad$ yuan, 1 catty of pears $\qquad$ yuan, 1 catty of apples $\qquad$ yuan.
Reference answer: $2.5,3.2,6.7$
Key point: Equivalent substitution