factory used 40 tons of coal in June, and it used 15% more coal in May than in June. How many tons of coal was used in May?
某工厂六月份用煤40吨，五月份比六月份多用煤15%，五月份用煤多少吨？
<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">1 + (3/20)</gadget>
<output>23/20 = around 1.15</output>

<gadget id="calculator">40 * (23/20)</gadget>
<output>46</output>

<result>46</result>