How much is it to combine 90/6=15, 680-15=665 into one comprehensive formula.
把90/6=15，680-15=665，合并成一道综合算式是多少．
<gadget id="calculator">90 / 6</gadget>
<output>15</output>

<gadget id="calculator">680 - 15</gadget>
<output>665</output>

<result>665</result>