The volume ratio of glucose and distilled water in glucose injection is 1:19. The pharmacist has prepared 3800 ml of distilled water, how many ml of grape juice should be added to prepare the glucose injection?
葡萄糖注射液中葡萄糖和蒸馏水的体积比是1：19．药剂师准备了3800毫升蒸馏水，要配制葡萄糖注射液，需要加入多少毫升葡萄搪？
<gadget id="calculator">1 / 19</gadget>
<output>1/19 = around 0.052632</output>

<gadget id="calculator">(1/19) * 3_800</gadget>
<output>200</output>

<result>200</result>