Wang Rui's family spent 180 yuan on telephone bills this month, and the electricity bills were telephone bills (5/9) and gas bills (3/5). How much did Wang Rui's family spend on gas this month?
王蕊家本月支出电话费180元，支出的电费是电话费的(5/9)，同时又是煤气费的(3/5)．王蕊家本月支出的煤气费是多少元？
<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(5/9) / (3/5)</gadget>
<output>25/27 = around 0.925926</output>

<gadget id="calculator">180 * (25/27)</gadget>
<output>500/3 = around 166.666667</output>

<result>500/3 = around 166.666667</result>