Question

The mean a-2,a,a+5 is 7 then a​

Answer 1

Answer:

a=2

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Answer 2

Answer:

$(a - 2 + a + a + 5) \div 3 = 7 \\ (3a + 3) = 7 \times 3 \\ 3a + 3 = 21 \\ 3a = 21 - 3 \\ 3a = 18 \\ a = 18 \div 3 \\ a = 6$

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