Question

The sum of three consecutive multiples of 7 is 777. find these multiples. (hint: three consecutive multiples of 7 are ‘x', ‘x + 7', ‘x + 14')

Answer 1

The charge of the electron is equivalent to the magnitude of the elementary charge (e) but bearing a negative sign. Since the value of the elementary charge is roughly 1.602 x 10-19coulombs (C), then the charge of the electron is -1.602 x 10-19 C.

Answer 2

Here is your answer

Let,
The three consecutive multiples of 7 be 7x, 7x + 7 and 7x + 14.

7x + (7x + 7) + (7x + 14) = 777 (Given)

⇒21x + 21 = 777

⇒ 21x = 777 – 21

⇒ 21x = 756

⇒ x = 36


Number are:-

7x=7×36=252

7x + 7 = 252 + 7 = 259

7x + 14 = 252 + 14= 266


Hence,

The three consecutive multiples of 7 are 252, 259 and 266

Hope it helps you