There are gold and tin in an alloy. The mass ratio of gold and tin is 5:7. It is known that tin is 100 grams more than gold. How many grams is tin?
一块合金中有金和锡，金和锡的质量比是5：7，已知锡比金多100克，锡是多少克？
<gadget id="calculator">7 - 5</gadget>
<output>2</output>

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

<gadget id="calculator">50 * 7</gadget>
<output>350</output>

<result>350</result>