A university allocates 42,000 yuan of research funding to three professors A, B, and C. The funding received by Professor A is equal to the sum of the funding received by Professors B and C. Professor B earns less than Professor C (1/4). How much does Professor B get for research funding?
一所大学将42000元的研究经费分配给甲、乙、丙三位教授．甲教授得到的经费等于乙、丙两位教授所得经费的和．乙教授比丙教授少得(1/4)．乙教授得到研究经费多少元？
<gadget id="calculator">42_000 / 2</gadget>
<output>21_000</output>

<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">1 + (3/4)</gadget>
<output>7/4 = around 1.75</output>

<gadget id="calculator">42_000 / 2 / (7/4)</gadget>
<output>12_000</output>

<gadget id="calculator">21_000 - 12_000</gadget>
<output>9_000</output>

<result>9_000</result>