The average (arithmetic mean) of a, b, and c is 90, while...

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655-705

Algebra

The average (arithmetic mean) of a, b, and c is 90, while the average (arithmetic mean) of a, b, c, d, and e is 80. Given that

d = \frac{a+b}{2}

e = \frac{b+c}{2}

, and

a ≥ c

, what is the minimum possible value of a?

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655-705

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