A disinfectant solution is required to be prepared by adding 15 grams of medicinal powder to 5 liters of water. The capacity of the disinfection tank is about 50 liters. How many grams of medicine powder should be added to the water in a disinfection tank to prepare the disinfectant solution?
一种消毒液，要求按5升水中加入15克药粉的比例配制．消毒池的容量约为50升，一消毒池的水需配加多少克药粉才能配好消毒液？
<gadget id="calculator">15 / 5</gadget>
<output>3</output>

<gadget id="calculator">3 * 50</gadget>
<output>150</output>

<result>150</result>