The iodine tincture commonly used in hospitals is made of iodine and alcohol in a ratio of 2:25. Now, how many grams of iodine are needed to prepare 1890 grams of such iodine tincture?
医院常用的碘酒是用碘和酒精按2：25的比例配成的，现在要配制1890克这样的碘酒，需要碘多少克？
<gadget id="calculator">2 + 25</gadget>
<output>27</output>

<gadget id="calculator">2 / 27</gadget>
<output>2/27 = around 0.074074</output>

<gadget id="calculator">1_890 * (2/27)</gadget>
<output>140</output>

<result>140</result>