The number of A is 1860, which is 180 less than three times the number of B. Find the number of B. what is the correct formula
甲数是1860，比乙数的3倍少180，求乙数．正确的算式是多少
<gadget id="calculator">1_860 + 180</gadget>
<output>2_040</output>

<gadget id="calculator">2_040 / 3</gadget>
<output>680</output>

<result>680</result>