if 9 is the mean of 5.7 a.a.10.11 find a
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5+7+a+a+10+11÷6=9
→33+2a=54
→2a=54-33=21
→a=21÷2=10:5
→33+2a=54
→2a=54-33=21
→a=21÷2=10:5
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Answer:
The answer is 10:5
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