Four brothers go to buy a TV set together, the boss brings half of the total money of the other three people, the second child brings 1/3 of the total money of the other three people (1/3), the third child brings The money to go is 1/4 of the total money of the other three people, and the fourth child brings 91 yuan. So how much is this TV set?
兄弟四人一起去买一台电视机，老大带的钱是另外三个人所带总钱数的一半，老二带去的钱是另外三个人总钱数的(1/3)，老三带去的钱是另外三个人总钱数的(1/4)，老四带91元．那么这台电视机是多少元．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 + (1/2)</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">(1/2) / (3/2)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 + (1/3)</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">(1/2) / (3/2) / (4/3)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">(1/2) / (3/2) / (4/3) / (5/4)</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">91 / (13/60)</gadget>
<output>420</output>

<result>420</result>