A factory adopts the latest technology and uses 14 tons of materials per day. In this way, the materials used for 7 days can be used for 10 days now. How many tons of materials were used per day?
某工厂采用最新技术，每天用料14吨，这样原来7天的用料，现在可用10天，原来每天用料几吨？
<gadget id="calculator">14 * 10</gadget>
<output>140</output>

<gadget id="calculator">140 / 7</gadget>
<output>20</output>

<result>20</result>