Jinghua Supermarket has 180 kilograms of grass carp. After selling 1/5 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(1/5)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">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">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">(4/5) / (9/10)</gadget>
<output>8/9 = around 0.888889</output>

<gadget id="calculator">180 * (8/9)</gadget>
<output>160</output>

<result>160</result>