What is Y, and what is Z

Question

X+X+X=75
X-Y*Y=0
Z+Y-X=10

X=25

Y=?

Z=?

Answer 1

The value of y has two solutions.

 

25 - y² = 0

 

(5 - y)(5 + y) = 0

 

y = -5      and      y = 5

 

 

Because of this, z also has two solutions.

 

z - 5 - 25 = 0              and             z + 5 - 25 = 0

 

z = 30                         and                z = 20

Answer 2

x + x + x = 75

3x = 75

x = 75/3

x = 25

 

x - y*y = 0

25 - y² = 0

25 = y²

√25 = y

5 = y

 

z + y - x = 10

z + 5 - 25 = 10

z + 5 = 35

z = 30