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英语数学问题我觉得老师答案不对,我把题目写在这里A cup of coffee has a temperature of

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英语数学问题
我觉得老师答案不对,我把题目写在这里
A cup of coffee has a temperature of 100 when it is first prepared.It is left to sit on the counter until it reaches a temperature of 20.The temperature dcreases 20% every 5 minute
第一个问题是叫我写formula
我写了T=100x(80%）^(t/5)
老师给的答案是T=80x（80%）^(t/5)+20
求教
如果按照老师的答案,那么就改变了题目的意思了
英语数学问题我觉得老师答案不对,我把题目写在这里A cup of coffee has a temperature of
应该是：
100x(1-20%)^(t/5)=20
(时间t的单位为分钟）
再问： 他第一个问题要我写
Write a formula to represent this situation
按照你这么说，那么我答案不就对了 T=100x（0.8）^(t/5) 20
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