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If the average (arithmetic mean) of a and b is 45, and the

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If the average (arithmetic mean) of a and b is 45, and the [#permalink] New post 19 Dec 2004, 17:31
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6. If the average (arithmetic mean) of a and b is 45, and the average of b and c is 70, what is the value of c – a?

I got lost in getting c – a
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 [#permalink] New post 19 Dec 2004, 21:29
50 it is. As the average is given , we can get the the sum of the numbers.

a+b = 90 & b+c = 140. So substract 2nd equation from the first and we will get 50 as c-a
  [#permalink] 19 Dec 2004, 21:29
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If the average (arithmetic mean) of a and b is 45, and the

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