Warehouse A stores 180 tons of grain, and Warehouse B stores 120 tons of grain. After Warehouse A ships part of it to Warehouse B, the grain ratio between Warehouse B and Warehouse A is 7:3. How many tons of grain did Warehouse A transport to Warehouse B?
甲仓库存粮食180吨，乙仓库存粮食120吨，甲仓库运出一部分到乙仓库后，乙仓库与甲仓库的粮食比7：3．甲仓库运了多少吨粮食到乙仓库？
<gadget id="calculator">180 + 120</gadget>
<output>300</output>

<gadget id="calculator">7 + 3</gadget>
<output>10</output>

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">300 * (3/10)</gadget>
<output>90</output>

<gadget id="calculator">180 - 90</gadget>
<output>90</output>

<result>90</result>