In a triangle, one side is 12 cm, the other side is 115% of the first, and the perimeter is 300%

In a triangle, one side is 12 cm, the other side is 115% of the first, and the perimeter is 300% of the first. Find the unknown side of the triangle.

Find the second side of the triangle, which is 115% of the first:

12 * 115/100 = 13.8 cm;

Let’s find the value of the perimeter:

12 * 300/100 = 12 * 3 = 36 cm;

We subtract two known sides from the value of the perimeter and find the unknown:

36 – 12 – 13.8 = 10.2 cm.

Answer: the third side of the triangle is 10.2 cm.