How many times is the sum of the three largest prime numbers less than 20 the sum of the three smallest prime numbers?
20以内的三个最大质数的和是三个最小质数的和的多少倍．
<gadget id="calculator">13 + 17 + 19</gadget>
<output>49</output>

<gadget id="calculator">2 + 3 + 5</gadget>
<output>10</output>

<gadget id="calculator">49 / 10</gadget>
<output>49/10 = around 4.9</output>

<result>49/10 = around 4.9</result>