A's number is 80, which is 16 less than B's (4/5), what is B's number?
甲数是80，比乙数的(4/5)少16，乙数是多少？
<gadget id="calculator">80 + 16</gadget>
<output>96</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">96 / (4/5)</gadget>
<output>120</output>

<result>120</result>