Teacher Li buys sporting goods for the school. The money he brings can buy 15 basketballs or 20 footballs. If he wants to buy 12 footballs, how many basketballs can he buy with the remaining money?
李老师为学校买体育用品，他所带的钱可以买15个篮球或20个足球，如果要买12个足球，剩下的钱还可以买多少个篮球？
<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(1/20) * 12</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">(2/5) / (1/15)</gadget>
<output>6</output>

<result>6</result>