Question
There are three numbers 'a', 'b' and 'c' (a < b <
There are three numbers 'a', 'b' and 'c' (a < b <
c) such that 'b' is equal to the average of 'a' and 'c'. 70% of 'c' is equal to 'a' and the difference between 'b' and 'c' is 21. Find the sum of all three numbers.
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