The store brings in some biscuits and sells them on the first day (2/5) and on the second day (3/8). The first day sells 4 more boxes than the second day. How many boxes of these biscuits are there in total?
商店运进一些饼干，第一天卖出(2/5)，第二天卖出(3/8)，第一天比第二天多卖出4箱，这些饼干一共有多少箱？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">(2/5) - (3/8)</gadget>
<output>1/40 = around 0.025</output>

<gadget id="calculator">4 / (1/40)</gadget>
<output>160</output>

<result>160</result>