If 5 grams of copper are added to the alloy of copper and zinc, the ratio of copper to zinc in the resulting new alloy is 5:2; if 6 grams of zinc are added to this alloy of copper and zinc, the ratio of copper to zinc in the new alloy is The ratio is 15:8, find the quality of the original alloy.
如果在铜与锌的合金中加入5克铜，所得新合金中铜与锌的比是5：2；如果在这块铜与锌的合金中加入6克锌，所得新合金中铜与锌的比是15：8，求原合金质量．
<gadget id="calculator">15 / 8</gadget>
<output>15/8 = around 1.875</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(15/8) * 5 * (2/5)</gadget>
<output>15/4 = around 3.75</output>

<gadget id="calculator">(15/8) * 6</gadget>
<output>45/4 = around 11.25</output>

<gadget id="calculator">(15/4) + (45/4)</gadget>
<output>15</output>

<gadget id="calculator">(15/8) * (2/5)</gadget>
<output>3/4 = around 0.75</output>

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

<gadget id="calculator">15 / (1/4)</gadget>
<output>60</output>

<gadget id="calculator">60 + 26</gadget>
<output>86</output>

<result>86</result>