The mass ratio of a pesticide to water is 1:50, how many kilograms of water is needed to prepare 102 kg of this pesticide.
一种农药中药和水的质量比是1：50，若要配制这种农药102千克，需要水多少千克．
<gadget id="calculator">1 + 50</gadget>
<output>51</output>

<gadget id="calculator">102 / 51</gadget>
<output>2</output>

<gadget id="calculator">2 * 50</gadget>
<output>100</output>

<result>100</result>