((3/5)+(1/4))*60-27.
((3/5)+(1/4))*60-27．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(3/5) + (1/4)</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">(17/20) * 60</gadget>
<output>51</output>

<gadget id="calculator">51 - 27</gadget>
<output>24</output>

<result>24</result>