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问答题
If 10a + 10b =35, what is the average (arithmetic mean) of a and b?
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参考解析
解析：
由10a+10b=35可得10(a+b)=35→a+b=3.5，所以a和b的平均数是3.5÷2=1.75。
由10a+10b=35可得10(a+b)=35→a+b=3.5，所以a和b的平均数是3.5÷2=1.75。
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