Find the volume of a rectangular parallelepiped if: its width is 2.5 cm and is 5/8 of the height

Find the volume of a rectangular parallelepiped if: its width is 2.5 cm and is 5/8 of the height, and its length is 3.4 times the height?

Let’s find the height of the parallelepiped (finding the number by its fraction):
2.5: 5/8 = 2 5/10 * 8/5 = 25/10 * 8/5 = 5/5 * 4/1 = 1 * 4 = 4 (cm);
Let’s find the length of the parallelepiped:
4 * 3.4 = 13.6 (cm);
Find the volume of the parallelepiped (a, b, c – length, width, height of the parallelepiped);
V = a * b * c = 13.6 * 2.5 * 4 = 13.6 * 10 = 136 (cm ^ 3).
Answer: 136 cm ^ 3.