(3/4) of the number A is equivalent to the number B. After adding 7.5 to the number B, it is equal to the number A. What is the number B?
甲数的(3/4)相当于乙数，乙数加上7.5以后与甲数相等，乙数是多少．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">7.5 / (1/4)</gadget>
<output>30</output>

<gadget id="calculator">30 - 7.5</gadget>
<output>22.5</output>

<result>22.5</result>