Aunt Wang bought 2 boxes of biscuits for a total of 90 yuan, and bought 3 boxes of milk for a total of 216 yuan. How much is a box of milk more expensive than a box of biscuits?
王阿姨买2盒饼干一共用去90元，买3箱牛奶一共要去216元．一箱牛奶比一盒饼干贵多少元？
<gadget id="calculator">216 / 3</gadget>
<output>72</output>

<gadget id="calculator">90 / 2</gadget>
<output>45</output>

<gadget id="calculator">72 - 45</gadget>
<output>27</output>

<result>27</result>