A certain grain store has 165 tons of rice and flour in total. After the rice is sold (1/5), another 15 tons of flour are shipped in. At this time, the rice weighs the same as the flour. How many tons of rice does this grain store have? (solution by equation)
某粮店有大米、面粉共165吨，大米售出(1/5)后，又运进面粉15吨，这时大米和面粉一样重，这个粮店原有大米多少吨？(用方程解)
<gadget id="calculator">165 + 15</gadget>
<output>180</output>

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

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 + (4/5)</gadget>
<output>9/5 = around 1.8</output>

<gadget id="calculator">180 / (9/5)</gadget>
<output>100</output>

<result>100</result>