The grain store shipped 72 tons of rice, 12 tons more than three times the amount of flour shipped in. How many tons of flour were shipped? (solution by equation)
粮店运来72吨大米，比运来的面粉的3倍多12吨，运来面粉多少吨？(用方程解)
<gadget id="calculator">72 - 12</gadget>
<output>60</output>

<gadget id="calculator">60 / 3</gadget>
<output>20</output>

<result>20</result>