One half of 6 times a number is 7.5, find this number.
一个数的6倍的一半是7.5，求这个数．
<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">7.5 / 3</gadget>
<output>2.5</output>

<result>2.5</result>