The sum of 4 times the number A plus (3/4) is exactly (7/12) of the number B. The number B is 15. What is the number A?
甲数的4倍加上(3/4)的和，正好是乙数的(7/12)，乙数是15，甲数是多少？
<gadget id="calculator">7 / 12</gadget>
<output>7/12 = around 0.583333</output>

<gadget id="calculator">15 * (7/12)</gadget>
<output>35/4 = around 8.75</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(35/4) - (3/4)</gadget>
<output>8</output>

<gadget id="calculator">8 / 4</gadget>
<output>2</output>

<result>2</result>