Mom bought 4 packs of biscuits and 2 pieces of bread, which cost 13.2 yuan. Bread is 1.8 yuan each, how much is a package of biscuits?
妈妈买了4包饼干和2只面包，共用了13.2元．面包每只1.8元，饼干每包多少元？
<gadget id="calculator">1.8 * 2</gadget>
<output>3.6</output>

<gadget id="calculator">13.2 - 3.6</gadget>
<output>9.6</output>

<gadget id="calculator">9.6 / 4</gadget>
<output>2.4</output>

<result>2.4</result>