In 900/60, when the dividend is reduced by 120, how much does the quotient decrease
在900/60中，当被除数减少120时，商减少多少
<gadget id="calculator">900 / 60</gadget>
<output>15</output>

<gadget id="calculator">900 - 120</gadget>
<output>780</output>

<gadget id="calculator">780 / 60</gadget>
<output>13</output>

<gadget id="calculator">15 - 13</gadget>
<output>2</output>

<result>2</result>