英语翻译Saul plays a video game in which he scores 4 for a hit and lost 6 for a miss.After 20 rounds his scores is 30.The number of times he has missed is ( ) 英语
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【答案】 Saul玩一个游戏,打中一次得4分,失败一次扣6分,20轮后他得到30分.问他一共失败了多少次?
设他失败了x次
成功为20-x此
则又(20-x)4-6x=30
80-10x=30
x=5
他失败了5次