This plus that is twenty-one,this minus that is five.What is this and what is that?

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This plus that is twenty-one,this minus that is five.What is this and what is that?

This plus that is twenty-one,this minus that is five.What is this and what is that?
This plus that is twenty-one,this minus that is five.What is this and what is that?

This plus that is twenty-one,this minus that is five.What is this and what is that?
设:this=x that =y
列方程:x+y=21
x-y=5
解方程得:x=13 y=8
即:this=13 that=8
因此答案为:This is thirteen and that is eight .
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