Three years ago, the age of the grandfather was 10 times the age of the grandson. Six years ago, the age of the grandfather was 19 times the age of the grandson. How many times is the age of the grandfather this year than the age of the grandson?
三年前爷爷的年龄是孙子年龄的10倍，六年前爷爷的年龄是孙子年龄的19倍，则今年爷爷的年龄是孙子年龄的多少倍．
<gadget id="calculator">6 - 3</gadget>
<output>3</output>

<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">19 - 1</gadget>
<output>18</output>

<gadget id="calculator">1 / 18</gadget>
<output>1/18 = around 0.055556</output>

<gadget id="calculator">(1/9) - (1/18)</gadget>
<output>1/18 = around 0.055556</output>

<gadget id="calculator">3 / (1/18)</gadget>
<output>54</output>

<gadget id="calculator">54 * (1/9)</gadget>
<output>6</output>

<gadget id="calculator">6 * 10</gadget>
<output>60</output>

<gadget id="calculator">60 + 3</gadget>
<output>63</output>

<gadget id="calculator">6 + 3</gadget>
<output>9</output>

<gadget id="calculator">63 / 9</gadget>
<output>7</output>

<result>7</result>