某次智力竞赛有2c道题,答对1道题得5分,答错或不答1道题倒扣c分,小威得79分,他答对______道题.

1个回答

  • 假设全答对了,则答错数量为:

    (2n×y-7多)÷(y+四),

    =24÷多,

    =4(道),

    答对:2n-4=四多(道).

    答:他答对四多道题.

    故答案为:四多.