(1/4) of the number A is equal 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(1/4)等于乙数，乙数加上7.5之后与甲数相等，乙数是多少？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">7.5 / (3/4)</gadget>
<output>10</output>

<gadget id="calculator">10 - 7.5</gadget>
<output>2.5</output>

<result>2.5</result>