in a competition,,20marks were given for each correct answer,,10marks were deducted for each wrong answer,,and 5marks were deducted for each question given up.Jimmy answered 3題岩左 ,,5題錯左 and give up the rest If jimmy got 0mark,,how many question were provided for him in the competition.
(姐係話系1個比賽入面,,岩左1題就有20分..錯左1題就扣10分,,棄權/吾答就扣5分,,jimmy 答岩左3題,,錯左5題,,最後有0分..問佢有幾多題係棄權..凈係比條式我就ok)
更新1:
仲有呀,,吾好用方程-.-"
