If the value of 5X+3 is 24, then 0.5X+15=what.
如果5X+3的值是24，那么0.5X+15=多少．
<gadget id="calculator">24 - 3</gadget>
<output>21</output>

<gadget id="calculator">21 / 5</gadget>
<output>21/5 = around 4.2</output>

<gadget id="calculator">0.5 * (21/5)</gadget>
<output>2.1</output>

<gadget id="calculator">2.1 + 15</gadget>
<output>17.1</output>

<result>17.1</result>