【Question 11】
Mom goes to the supermarket to sell fruits, buying 5 kilograms of apples and 4 kilograms of pears costs 48 yuan, buying 2 kilograms of apples and 3 kilograms of mangoes costs 33 yuan. It is known that each kilogram of mangoes is 2.5 yuan more expensive than pears. If 3 kilograms of apples and 3 kilograms of pears are bought, the total cost would be $\qquad$ yuan.
【Analysis and Solution】
Let the price of apples be $x$ yuan/kg, pears $y$ yuan/kg, and mangoes $z$ yuan/kg;
$\left\{\begin{array}{c}5 x+4 y=48 \\ 2 x+3 z=33 \\ z-y=2.5\end{array}\right.$; Solving, we get $\left\{\begin{array}{c}x=6 \\ y=4.5 \\ z=7\end{array}\right.$
If 3 kg of apples and 3 kg of pears are bought, the total cost would be $6 \times 3+4.5 \times 3=31.5$ yuan.