A factory uses 14 tons of coal per day after technological innovation, so that the coal used for 7 days can now be used for 10 days. How many tons of coal did this factory use every day?
某工厂通过技术革新后每天用煤14吨，这样原来7天用的煤，现在可以用10天．这个厂原来每天用煤多少吨？
<gadget id="calculator">10 / 7</gadget>
<output>10/7 = around 1.428571</output>

<gadget id="calculator">14 * (10/7)</gadget>
<output>20</output>

<result>20</result>