word problem with triangle perimeter

Question

A certain trisngle has a perimeter of 3064mi the shortest side measures 79mi less than the middle side and the longest side measures 377mi more than the middle side. find the lengths of the three sides

Answer 1

First of all: your English grammar needs attention too!

A sentence begins with a capital letter and ends with period.

Think that is unimportant? You are wrong!

There are 3 sides: y, x=y-79 and z=y+377.

The sum of those 3 sides is 3064

Add the expressions for the sides in terms of y and solve the resulting equation for your answer for y and the use the original expressions to calculate x and z.