There are 12 boxes of tea leaves, and the quality of each box of tea leaves is the same. If 150 grams of tea leaves are taken out of each box, then the sum of the masses of the remaining tea leaves is exactly equal to the mass of the original 9 boxes of tea leaves. What is the mass of each box of tea in grams?
有12盒茶叶，每盒茶叶的质量相同，如果从每盒里都取出150克茶叶，那么剩下茶叶的质量总和正好等于原来9盒茶叶的质量．原来每盒茶叶的质量是多少克？
<gadget id="calculator">12 - 9</gadget>
<output>3</output>

<gadget id="calculator">12 / 3</gadget>
<output>4</output>

<gadget id="calculator">150 * 4</gadget>
<output>600</output>

<result>600</result>