One side of the triangle is 2.4 / 5m, which is 3 / 10m longer than the second side, and the third side is 1.7 / 20m

One side of the triangle is 2.4 / 5m, which is 3 / 10m longer than the second side, and the third side is 1.7 / 20m longer than the other. What is the perimeter of the triangle?

Let’s determine what value the second side of the figure presented in the conditions is equal to, because we know that it is 3/10 m shorter than the known one:

2 4/5 – 3/10 = 2.8 – 0.3 = 2.5.

Let us determine what value the third side of the figure presented in the conditions is equal to, because we know that it is 1 7/20 m longer than the one found above:

2.5 + 1 7/20 = 2.5 + 1.35 = 3.85.

Now let’s determine what the perimeter of the figure presented in the conditions will be equal to, adding all the lengths:

2.8 + 2.5 + 3.85 = 9.15.

Answer: The perimeter is 9.15 m.