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ATQ,
As we know the least number which is divisible by 'a', 'b', and 'c' is the LCM of 'a', 'b', and 'c'.
So, the number which is completely divisible by 9, 18, and 27 = LCM of 9,
18, and 27 = 54
So, 'R' = 54 + 6 = 60
Now,
(7R - 20) = (60 × 7) - 20 = 420 - 20 = 400
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