Jinghua Supermarket has 180 kilograms of grass carp. After selling (2/5) of it, the weight of the remaining grass carp is equivalent to 90% of that of shrimp. How many kilograms of shrimp are there in the supermarket?
京华超市有草鱼180千克，卖出它的(2/5)后，剩下的草鱼重量相当于虾的90%，超市中有虾多少千克？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">(3/5) / (9/10)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">180 * (2/3)</gadget>
<output>120</output>

<result>120</result>