a*b means 3 times of a minus (1/2) of b. For example: 1*2=1*3-2*(1/2)=2, according to the above regulations, what should 10*6 be equal to?
a*b表示a的3倍减去b的(1/2)．例如：1*2=1*3-2*(1/2)=2，根据以上的规定，10*6应该等于多少．
<gadget id="calculator">10 * 3</gadget>
<output>30</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">6 * (1/2)</gadget>
<output>3</output>

<gadget id="calculator">30 - 3</gadget>
<output>27</output>

<result>27</result>