Given X: Y: z = 4:5:7, find the value of 2x + 3Y + Z / 5Z, the square of X + the square of Y / the square of Y - the square of X

Given X: Y: z = 4:5:7, find the value of 2x + 3Y + Z / 5Z, the square of X + the square of Y / the square of Y - the square of X

Let x = 4T, y = 5T, z = 7T
Then (2x + 3Y + Z) / 5Z = (8t + 15t + 7T) / 35t = 6 / 7
In the same way, replace x = 4T, y = 5T, z = 7T into the square of X + the square of Y / the square of Y - the square of X for simplification