Question

find two consecutive multiple of 3 whose sum is 415

Answer 1

Let first multiple be x

then,
second will be x + 3

as according to question

sum is 415

x + x + 3 = 415

2x = 415 - 3

x = 412/2

x = 206

First number :-
x = 206


Second number :-
x + 3

206 + 3 = 209