The school bought 4 volleyballs and some basketballs. The volleyballs are 28 yuan each, and the basketballs are 35 yuan each. The total is 357 yuan. How many basketballs did the school buy?
学校买来4个排球和一些篮球，排球每个28元，篮球每个35元，共用357元，学校买了多少个篮球？
<gadget id="calculator">4 * 28</gadget>
<output>112</output>

<gadget id="calculator">357 - 112</gadget>
<output>245</output>

<gadget id="calculator">245 / 35</gadget>
<output>7</output>

<result>7</result>