A, B, C, and D together buy a computer, the ratio of A’s money to the other three’s money is 1:3, B’s money to the other three’s money is 1:4, C’s The ratio of the money paid by the other three people is 1:5, and the money paid by Ding is 690 yuan. How much is this computer?
甲、乙、丙、丁合买一台电脑，甲出的钱与其余三人出的钱的比是1：3，乙出的钱与其余三人出的钱的比是1：4，丙出的钱与其余三人出的钱的比是1：5，丁出的钱是690元，这台电脑多少钱？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

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

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 - (1/4) - (1/5) - (1/6)</gadget>
<output>23/60 = around 0.383333</output>

<gadget id="calculator">690 / (23/60)</gadget>
<output>1_800</output>

<result>1_800</result>