Hope Primary School gets a donation. If all of it is used to buy tables, you can buy 80. If all of it is used to buy chairs, you can buy 240. If you make a table and two chairs into a set, how much can you buy with this donation? Set of tables and chairs?
希望小学得到一笔捐款，如果全部用来买桌子，可以买80张，如果全部用来买椅子，可以买240把，把一张桌子和两把椅子配成一套，这笔捐款可以买多少套桌椅？
<gadget id="calculator">1 / 80</gadget>
<output>1/80 = around 0.0125</output>

<gadget id="calculator">1 / 240</gadget>
<output>1/240 = around 0.004167</output>

<gadget id="calculator">(1/240) * 2</gadget>
<output>1/120 = around 0.008333</output>

<gadget id="calculator">(1/80) + (1/120)</gadget>
<output>1/48 = around 0.020833</output>

<gadget id="calculator">1 / (1/48)</gadget>
<output>48</output>

<result>48</result>