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【OG20-P279-313题】Jack picked 76 apples. Of these, he sold 4y apples to Juanita and 3t apples to Sylvia. If he kept the remaining apples, how many apples did he keep?(t and y are positive integers.)
1.y≥15 and t=2
2.y=17
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【知识点】
解二元一次方程组
【解析】
求76-4y-3t
条件1:y≥15,t=2,76-4y-3t=70-4y≤10,y具体大小未知,不充分
条件2:y=17,76-4y-3t=8-3t,t未知,不充分
结合:t=2,y=17,76-4y-3t=2,充分
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