The product of the numbers A and B is 100, which is exactly 4 times the sum of the numbers A and B, and the number A is 1/4 of the number B. What is the number B?
甲、乙两数的积是100，正好是甲、乙两数和的4倍，而甲数又是乙数的(1/4)，乙数是多少．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

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

<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<gadget id="calculator">100 / 5</gadget>
<output>20</output>

<result>20</result>