A box of apples weighs 15 kg, and a box of pomegranates is 2 kg less than twice the weight of a box of apples. How much does a box of pomegranates weigh?
一箱苹果重15千克，一箱石榴比一箱苹果的2倍少2千克．一箱石榴重多少干克？
<gadget id="calculator">15 * 2</gadget>
<output>30</output>

<gadget id="calculator">30 - 2</gadget>
<output>28</output>

<result>28</result>