Question

sum of 3 consecutive multiples of 7 is 777.find multiples

Answer 1

Let one multiple be x
Another multiple will be x+7
Third multiple will be x+14
According to problem,
( x)+ (x+7)+(x+14)=777
3x+21=777
3x=756
x=252
Therefore the multiples are 252,259,266

Answer 2

If the multiple in n then the three consecutive numbers would be:
7n,7n+7 and 7n+14
(7n)+(7n+7)+(7n+14)=777
21n+21=777
21n=756
n=36
So, the three consecutive numbers are:
252, 259 and 266