Question

the sum of three consecutive numbers of 7 is 777 find the number

Answer 1

Sum of 3 consecutive multiples of 7 is 777.

Let the consecutive multiples of 7 be 7n, (7n + 7) and (7n + 14).

⇒ (7n) +  (7n + 7) + (7n + 14) = 777

⇒ 21n + 21 = 777

⇒ 21n = 756

⇒ n = 36

Therefore, multiples of 7 whose sum is 777 are (7 x 36), (7 x 36) + 7 and (7 x 36) + 14.That is 252, 259 and 266.

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Answer 2

let three no's be x,x+7,x+14

sum= 3x + 21 = 777
3x = 756

x = 252