A factory burns 180 tons of coal in May, which is 1/5 more than in April. How many tons of coal is burned in April?
某厂五月份烧煤180吨，比四月份多烧(1/5)，四月份烧煤多少吨？
<gadget id="calculator">1 / 5</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">180 / (6/5)</gadget>
<output>150</output>

<result>150</result>