Mr. Tao’s family spent 28 yuan more on water and electricity last month than this month, and this month’s water and electricity savings (2/9) compared to last month. How much was the water and electricity used last month?
陶老师家上月用去的水电费比本月多28元，本月的水电费比上月节约(2/9)，上月用去水电费多少元．
<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">28 / (2/9)</gadget>
<output>126</output>

<result>126</result>