The students in the flower arrangement group of the school have to rush to make 70 flower baskets. They have been doing it for 5 days, and they have made a total of 40 flower baskets. The rest should be finished within 2 days, so how many more flower baskets can be made on average every day than before.
学校插花组同学要赶制花篮70个，已经做了5天，共做花篮40个．余下的要赶在2天做完，这样每天比原来平均多做多少个花篮．
<gadget id="calculator">70 - 40</gadget>
<output>30</output>

<gadget id="calculator">30 / 2</gadget>
<output>15</output>

<gadget id="calculator">40 / 5</gadget>
<output>8</output>

<gadget id="calculator">15 - 8</gadget>
<output>7</output>

<result>7</result>