50 grams of salt water contains 45 grams of water, so how much salt is salt water
50克盐水中含水45克，那么盐是盐水的多少
<gadget id="calculator">50 - 45</gadget>
<output>5</output>

<gadget id="calculator">5 / 50</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>