There are volleyballs, softballs, footballs, and basketballs in the sporting goods store. Among them, there are 15 more volleyballs than softballs, twice as many footballs as softballs, and 1 less basketball than footballs. There are 28 volleyballs in total. How many basketballs are there in the store? Only?
体育用品商店里有排球、垒球、足球、篮球，其中排球比垒球多15只，足球的只数是垒球的2倍，篮球比足球少1只，排球一共有28只，商店里一共有篮球多少只？
<gadget id="calculator">28 - 15</gadget>
<output>13</output>

<gadget id="calculator">13 * 2</gadget>
<output>26</output>

<gadget id="calculator">26 - 1</gadget>
<output>25</output>

<result>25</result>