The stored grains of the two grain depots A and B are equal, A grain depot shipped out (1/3) of the stored grain for the first time, and 18 tons for the second time, B grain depot shipped out (1/5) of the stored grain for the first time, and second 30 tons are shipped out each time, and the remaining grain in the two grain depots is equal at this time. How many tons of grain did the two depots store? (no equation solution)
甲乙两粮库的存粮相等，甲粮库第一次运出存粮的(1/3)，第二次运出18吨，乙粮库第一次运出存粮的(1/5)，第二次运出30吨，这时两粮库剩下的粮食相等．原来两粮库共存粮多少吨？(不用方程解答)
<gadget id="calculator">30 - 18</gadget>
<output>12</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/3) - (1/5)</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">12 / (2/15)</gadget>
<output>90</output>

<gadget id="calculator">90 * 2</gadget>
<output>180</output>

<result>180</result>