There are three fractions A, B, and C. The ratio of their numerators is 3:2:1, and the ratio of their denominators is 2:3:4. The sum of these three fractions is (29/60). Find the value of ABC.
有A、B、C三个分数，它们的分子之比是3：2：1，分母之比是2：3：4，这三个分数之和是(29/60)，求A-B-C的值．
<gadget id="calculator">29 / 60</gadget>
<output>29/60 = around 0.483333</output>

<gadget id="calculator">18 - 8 - 3</gadget>
<output>7</output>

<gadget id="calculator">18 + 8 + 3</gadget>
<output>29</output>

<gadget id="calculator">7 / 29</gadget>
<output>7/29 = around 0.241379</output>

<gadget id="calculator">(29/60) * (7/29)</gadget>
<output>7/60 = around 0.116667</output>

<result>7/60 = around 0.116667</result>