Question

If x-y=y-z=z-t=5, what is the value of x-t??

Answer 1

Where did you get 12?

Answer 2

It is a telescopic set of equations:
x-y=5
y-z=5
z-t=5
Add the three equations together, y & z cancel out to give
x-t=15

Answer 3

Holly hell, what kind of math is this?

Answer 4

Is this Calculus ?

Answer 5

On the PSAT's..-____-