On the eve of "Mother's Day", a store purchased the first batch of boxed flowers for 3,000 yuan according to market research, and they were sold out soon after they went on the market, and then bought the second batch of such boxed flowers for 5,000 yuan. It is known that the number of boxes of flowers purchased in the second batch is twice the number of flower boxes purchased in the first batch, and the purchase price of each box of flowers is 5 yuan less than that of the first batch. How much is the purchase price per box of the first batch of boxed flowers?
"母亲节"前夕，某商店根据市场调査，用3000元购进第一批盒装花，上市后很快售完，接着又用5000元购进第二批这种盒装花．已知第二批所购花的盒数是第一批所购花盒数的2倍，且每盒花的进价比第一批的进价少5元．求第一批盒装花每盒的进价是多少元？
<gadget id="calculator">2 * 3_000 * 5</gadget>
<output>30_000</output>

<gadget id="calculator">2 * 3_000</gadget>
<output>6_000</output>

<gadget id="calculator">6_000 - 5_000</gadget>
<output>1_000</output>

<gadget id="calculator">30_000 / 1_000</gadget>
<output>30</output>

<result>30</result>