In a sales promotion in a shopping mall, 54 T-shirts were sold on the first day, and (1/4) of the total amount was sold on the second day. At this time, the ratio of the sold T-shirts to the remaining ones is 4:3 , how many T-shirts are left?
某商场在一次促销活动中，第一天卖出T恤衫54件，第二天卖出总量的(1/4)，这时已卖出的T恤与剩下的件数比是4：3，还剩下T恤衫多少件？
<gadget id="calculator">4 + 3</gadget>
<output>7</output>

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(4/7) - (1/4)</gadget>
<output>9/28 = around 0.321429</output>

<gadget id="calculator">54 / (9/28)</gadget>
<output>168</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">168 * (3/7)</gadget>
<output>72</output>

<result>72</result>