5 times a number minus the quotient of 2.5 divided by 0.5, the difference is 6.5, find this number.
一个数的5倍减去2.5除以0.5的商，差是6.5，求这个数．
<gadget id="calculator">2.5 / 0.5</gadget>
<output>5</output>

<gadget id="calculator">6.5 + 5</gadget>
<output>11.5</output>

<gadget id="calculator">11.5 / 5</gadget>
<output>2.3</output>

<result>2.3</result>