Uncle Li’s family’s income this year is 60,000 yuan, 20% more than last year’s income. How much did Uncle Li’s family earn last year? (Solve with equations and arithmetic methods)
李叔叔家今年收入6万元，比去年的收入多了二成，李叔叔家去年收入多少万元？(用方程和算术方法解答)
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

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

<result>5</result>