If 10a + 10b =35, what is the average (arithmetic mean) of a

题目
问答题
If 10a + 10b =35, what is the average (arithmetic mean) of a and b?
参考答案和解析
正确答案: 1.75
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。
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