A Hua and A Hua did the same number of questions, and each correct answer added 10 points, and each wrong answer deducted 5 points. In the end, A Hua's score was 30 points higher than A Hua's. It is known that A Hua got 5 questions right, how many questions A Hua got right.
阿花和阿华做同样多的题目，每作对一道加10分，每做错一道扣5分，最后阿华的得分比阿花要高30分．已知阿华作对了5道，则阿花做对了多少道题．
<gadget id="calculator">10 + 5</gadget>
<output>15</output>

<gadget id="calculator">30 / 15</gadget>
<output>2</output>

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

<result>3</result>