((49/12)-(63/20)+(77/30)-(91/42))/(4/15)=how much.
((49/12)-(63/20)+(77/30)-(91/42))/(4/15)=多少．
<gadget id="calculator">49 / 12</gadget>
<output>49/12 = around 4.083333</output>

<gadget id="calculator">63 / 20</gadget>
<output>63/20 = around 3.15</output>

<gadget id="calculator">(49/12) - (63/20)</gadget>
<output>14/15 = around 0.933333</output>

<gadget id="calculator">77 / 30</gadget>
<output>77/30 = around 2.566667</output>

<gadget id="calculator">91 / 42</gadget>
<output>13/6 = around 2.166667</output>

<gadget id="calculator">(77/30) - (13/6)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(14/15) + (2/5)</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">4 / 15</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">(4/3) / (4/15)</gadget>
<output>5</output>

<result>5</result>