A pile of coal consumes (1/9) tons every day, how many tons are used in 5 days.
一堆煤，每天用去(1/9)吨，5天一共用去多少吨．
<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">(1/9) * 5</gadget>
<output>5/9 = around 0.555556</output>

<result>5/9 = around 0.555556</result>