Six English tests, the first score is 98 points, the average score of the last five tests is 0.5 points less than the average score of the six tests, the second score is 94.5 points, what is the average score of the last four tests.
六次英语测验，第一次得分98分，后五次平均分比六次平均少0.5分，第二次得分94.5分，后四次平均分为多少分．
<gadget id="calculator">98 / 6</gadget>
<output>49/3 = around 16.333333</output>

<gadget id="calculator">94.5 / 6</gadget>
<output>15.75</output>

<gadget id="calculator">94.5 / 5</gadget>
<output>18.9</output>

<gadget id="calculator">15.75 - 18.9 - 0.5</gadget>
<output>-3.65</output>

<gadget id="calculator">(49/3) + (-3.65)</gadget>
<output>12.683333</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">4 / 6</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(4/5) - (2/3)</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">12.683333 / (2/15)</gadget>
<output>95.124997</output>

<result>95.124997</result>