The ratio of the number of footballs to the number of basketballs in the school is 8:7, and now 10 footballs are bought. At this time, the ratio of the number of footballs to the number of basketballs is 3:2. How many basketballs does the school have?
学校原有足球个数和篮球个数的比是8：7，现在又买进10个足球，这时足球个数与篮球个数的比是3：2，学校原有篮球多少个？
<gadget id="calculator">10 * 2 * 8</gadget>
<output>160</output>

<gadget id="calculator">10 * 2 * 7</gadget>
<output>140</output>

<gadget id="calculator">160 + 140</gadget>
<output>300</output>

<gadget id="calculator">7 * 3</gadget>
<output>21</output>

<gadget id="calculator">7 * 2</gadget>
<output>14</output>

<gadget id="calculator">2 * 8</gadget>
<output>16</output>

<gadget id="calculator">2 * 7</gadget>
<output>14</output>

<gadget id="calculator">14 - 16 - 14</gadget>
<output>-16</output>

<gadget id="calculator">21 + (-16)</gadget>
<output>5</output>

<gadget id="calculator">300 / 5</gadget>
<output>60</output>

<gadget id="calculator">8 + 7</gadget>
<output>15</output>

<gadget id="calculator">7 / 15</gadget>
<output>7/15 = around 0.466667</output>

<gadget id="calculator">60 * (7/15)</gadget>
<output>28</output>

<result>28</result>