Mrs. Liu has four filial sons, and they are going to contribute some money to buy a plasma TV for the old mother. Boss: I will pay 50% of the sum of the three of you. The second child: The money I pay is the sum of the money paid by the three of you (1/3). Third child: I pay 25% of the sum of the three of you. Fourth child: Just do as you said and I will pay 949 yuan. How much is this plasma TV?
刘老太有四个孝顺的儿子，他们准备每个人都出点钱合起来给老母亲买一台等离子电视机．老大：我出的钱是你们三个人出钱总和的50%．老二：我出的钱是你们三个人出钱总和的(1/3)．老三：我出的钱是你们三个人总和的25%．老四：就按你们说的办我出949元．这台等离子电视机多少元？
<gadget id="calculator">1 + 2</gadget>
<output>3</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 + 3</gadget>
<output>4</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

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

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/3) - (1/4) - (1/5)</gadget>
<output>13/60 = around 0.216667</output>

<gadget id="calculator">949 / (13/60)</gadget>
<output>4_380</output>

<result>4_380</result>