Put the same number of strawberries in 15 baskets. If 18 strawberries are taken out from each basket, the sum of the remaining strawberries in the 15 baskets is equal to the sum of the number of grass poisons in the original 6 baskets. How many grass poisons are there in each basket?
在15个篮子里放入同样多的草莓，如果从每个篮子里拿出18颗草莓，则15个篮子里剩下的草莓颗数的总和等于原来6个篮子里的草毒数量的和，原来每个篮子里有草毒多少颗？
<gadget id="calculator">18 * 15</gadget>
<output>270</output>

<gadget id="calculator">15 - 6</gadget>
<output>9</output>

<gadget id="calculator">270 / 9</gadget>
<output>30</output>

<result>30</result>