From the product of 3.4 and 5, subtract the quotient of 7.5 divided by 5. What is the difference?
从3.4与5的积里，减去7.5除以5的商，差是多少？
<gadget id="calculator">3.4 * 5</gadget>
<output>17</output>

<gadget id="calculator">7.5 / 5</gadget>
<output>1.5</output>

<gadget id="calculator">17 - 1.5</gadget>
<output>15.5</output>

<result>15.5</result>