To make a batch of toys, plan to make 16 toys a day, and it will take 35 days. Actually do 20 a day, actually use a few days less than planned?
做一批玩具，计划每天做16个，要35天．实际每天做20个，实际比计划少用几天？
<gadget id="calculator">35 / 20</gadget>
<output>7/4 = around 1.75</output>

<gadget id="calculator">16 * (7/4)</gadget>
<output>28</output>

<gadget id="calculator">35 - 28</gadget>
<output>7</output>

<result>7</result>