Xiaogang’s house used 120 degrees of electricity in May, which was 1/7 less than in April. How much electricity was used in April?
小刚家五月份用电120度，比四月份节约了(1/7)，四月份用电多少度？
<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">1 - (1/7)</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">120 / (6/7)</gadget>
<output>140</output>

<result>140</result>