Xiaojun took the math test five times, with an average score of 70. He wants to raise the average score of the six times to 75 after the next test. What is the minimum score for the next test?
小军参加了五次数学考试，平均分是70分，他想下一次考后将六次的平均分提高到75分，下一次考试至少要得多少分？
<gadget id="calculator">75 * 6</gadget>
<output>450</output>

<gadget id="calculator">70 * 5</gadget>
<output>350</output>

<gadget id="calculator">450 - 350</gadget>
<output>100</output>

<result>100</result>