Mr. Li went to buy tables and chairs. With the money he brought, he could buy exactly 40 tables, and 60 chairs. So how many sets of desks and chairs can you buy with the money Mr. Li brings? (1 set of table and 1 chair is a set).
李老师去买桌椅，他带的钱如果只买桌子恰好可以买40张，如果只买椅子恰好可以买60把．那么李老师带的钱可以买多少套桌椅．(1套桌子和1把椅子为一套)．
<gadget id="calculator">1 / 40</gadget>
<output>1/40 = around 0.025</output>

<gadget id="calculator">1 / 60</gadget>
<output>1/60 = around 0.016667</output>

<gadget id="calculator">(1/40) + (1/60)</gadget>
<output>1/24 = around 0.041667</output>

<gadget id="calculator">1 / (1/24)</gadget>
<output>24</output>

<result>24</result>