Xiaolan's mother went to the supermarket to buy wool. She brought just enough money to buy 9.5 yuan per kilogram of wool and 4 kilograms of 8.5 yuan per kilogram of blue wool. Now she wants to use the money to buy 12.5 yuan per kilogram of yellow wool. kilogram?
小兰的妈妈到超市买毛线，带的钱刚好够买每千克9.5元的毛线和每千克8.5元的蓝毛线4千克，现在她想用这些钱买每千克12.5元的黄毛线，可以买几千克？
<gadget id="calculator">9.5 + 8.5</gadget>
<output>18</output>

<gadget id="calculator">4 / 12.5</gadget>
<output>0.32</output>

<gadget id="calculator">18 * 0.32</gadget>
<output>5.76</output>

<result>5.76</result>