The number A is 32.8, which is 3.6 less than 4 times the number B. Find the number B.
甲数是32.8，比乙数的4倍少3.6，求乙数．
<gadget id="calculator">32.8 + 3.6</gadget>
<output>36.4</output>

<gadget id="calculator">36.4 / 4</gadget>
<output>9.1</output>

<result>9.1</result>