The little ant transports a pile of rice. The ratio of the number of grains transported for the first time to the total number of grains is 1:10. If 12 more grains are transported, half of the rice in the pile can be transported. How many grains are there in total in the pile? ?
小蚂蚁运一堆米，第一次运走的粒数与总粒数之比是1：10，如果再运走12粒，就可以运走这堆米的一半，这堆米一共有多少粒？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/2) - (1/10)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">12 / (2/5)</gadget>
<output>30</output>

<result>30</result>