Question

the sum of three consecutive multiples of 7is777. find these multiples
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Answer 1

7x+1+7x+2+7x+3=777

21x=777

x=11/3

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Answer 2

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Let the numbers be x, x+7, x+14

x+x+7+x+14 = 777

3x+21 = 777

x = 777 - 21 / 3

= 756 / 3 = 252

the numbers are 252, 259, 266