Naughty is doing oral calculations, the ratio of the number of correct questions to the number of wrong questions is 4:1 after finishing the last question. After checking and modifying, 3 questions were corrected by Naughty. At this time, Naughty got it right (7/8) of the total number of questions, how many questions did Naughty do wrong?
淘气做口算题，做完最后一题时做对的题数与做错的题数的比是4：1，经过检查修改后，有3道题被淘气改对了，这时淘气做对了总题数的(7/8)，淘气还有几道题做错了？
<gadget id="calculator">7 / 8</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">4 + 1</gadget>
<output>5</output>

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

<gadget id="calculator">(7/8) - (4/5)</gadget>
<output>3/40 = around 0.075</output>

<gadget id="calculator">3 / (3/40)</gadget>
<output>40</output>

<gadget id="calculator">1 - (7/8)</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">40 * (1/8)</gadget>
<output>5</output>

<result>5</result>