A piece of rectangular land is just cut into two squares, and the perimeter is increased by 30 decimeters compared to the original. To plant strawberries in the field, each strawberry covers an area of 6 square decimeters. How many strawberries can be planted in total?
有一块长方形的地刚好截成两个正方形后，周长比原来增加了30分米，要在地里种草莓，每棵草莓占地6平方分米，一共可种多少棵草莓？
<gadget id="calculator">30 / 2</gadget>
<output>15</output>

<gadget id="calculator">15 * 15</gadget>
<output>225</output>

<gadget id="calculator">225 * 2</gadget>
<output>450</output>

<gadget id="calculator">450 / 6</gadget>
<output>75</output>

<result>75</result>