The sum of three consecutive multiples of 7 is 777. Find these multiples.
(Hint: Three consecutive multiples of 7 are 'r', 'x+7', 'x+ 14')
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Answer: Let the numbers be x, x+7, x+14
∴ x+x+7+x+14=777
∴3x + 21 = 777
∴3x = 756
∴x = 252 (which is a multiple of 7)
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