Uncle Zhang bought a batch of stationery boxes at a price of 2.80 yuan each, and then sold them at a price of 3.60 yuan each. When he sold (5/6) of the total, he not only recovered the cost, but also made a profit of 24.00 yuan. Uncle Zhang made a total of How many stationery boxes did you buy?
张叔叔以每个2.80元的价格购进一批文具盒，然后以每个3.60元的价格出售，当卖出总数的(5/6)时，不但收回成本，还盈利24.00元，张叔叔一共购进多少个文具盒？
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">(5/6) * 3.6</gadget>
<output>3</output>

<gadget id="calculator">3 - 2.8</gadget>
<output>0.2</output>

<gadget id="calculator">24 / 0.2</gadget>
<output>120</output>

<result>120</result>