Master Li’s home used 42 degrees of electricity in April, which was 1/7 less than in March. How much electricity did Master Li’s house use in March?
李师傅家四月份用电42度，四月份比三月份节约(1/7)，李师傅家三月份用电多少度？
<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">42 / (6/7)</gadget>
<output>49</output>

<result>49</result>