Question

find three consecutive number multiple of 7 whose sum is 777

Answer 1

equation will be

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

the equation is like this because if the first number is 7 then the next consecutive will be that number plus 7 and that is what i have done

3x+21=777

3x=756

x=756/3=252

hence numbers are 252,257 and 264

Answer 2

hey mate!!

let the three consecutive multiples of 7 be 7x , 7x+7 and 7x+14

so, according to the question
7x+7x+7+7x+14=777
21x+21=777
21x=777-21
21x=756
x=756/21
x=36

now. 7x=7*36=252
7x+7=7*36+7=252+7=259
7x+14=7*36+14=252+14=266

hope it helps!