Ryan has 57 plastic blocks that are either yellow or green. In 57-X, what does x equal?

so x can be either yellow or green

Step-by-step explanation:

Ryan has total 57 blocks (total yellow and green)

if x is either of yellow or green

then 57 - x will be either green or yellow (According to x is green or yellow)

x can be either yellow or green.

the amount of green blocks = X then you'll end up with the amount of yellow blocks