(4/9)*15+(5/9)/(1/15).
(4/9)*15+(5/9)/(1/15)．
<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">(4/9) * 15</gadget>
<output>20/3 = around 6.666667</output>

<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">(5/9) / (1/15)</gadget>
<output>25/3 = around 8.333333</output>

<gadget id="calculator">(20/3) + (25/3)</gadget>
<output>15</output>

<result>15</result>