Mr. Hong has 8 5 jiao coins, and the number of one yuan coins is 3 times of 5 jiao. If you want to make the amount of 50 cents equal to that of one yuan, how many 50 cents must Mr. Hong take?
洪老师有5角的硬币8个，一元硬币的个数是5角的3倍．如果要使5角的钱数与一元的钱数同样多，那么洪老师必须再拿多少个5角的硬币．
<gadget id="calculator">5 / 10</gadget>
<output>1/2 = around 0.5</output>

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

<gadget id="calculator">1 * 8 * 6</gadget>
<output>48</output>

<gadget id="calculator">48 - 8</gadget>
<output>40</output>

<result>40</result>