The number A is 5, which is 0.6 less than 2.8 times the number B. Find the number B.
甲数是5，比乙数的2.8倍少0.6，求乙数．
<gadget id="calculator">5 + 0.6</gadget>
<output>5.6</output>

<gadget id="calculator">5.6 / 2.8</gadget>
<output>2</output>

<result>2</result>