There are 30 kilograms of oil in the large and small barrels. After 5 kilograms of oil in the large barrel are used, the weight ratio of the remaining oil to the oil in the small barrel is 3:2. How many kilograms of crude oil is in the barrel?
大小桶共装油30千克，大桶油用去5千克后，剩下的油与小桶油的重量比是3：2．大桶原有油多少千克？
<gadget id="calculator">30 - 5</gadget>
<output>25</output>

<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">25 / 5</gadget>
<output>5</output>

<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<gadget id="calculator">15 + 5</gadget>
<output>20</output>

<result>20</result>