Which phrase describes an unknown or changeable quantity?

a. 4 quarts in a gallon
b. a score of 27 points
c. 80 miles per hour
d. the number of different colors on the page

"The number of different colors on the page" is the one phrase among the following choices given in the question that describes an unknown or changeable quantity. The correct option among all the options that are given in the question is the fourth option or option "D". I hope the answer helped you.

Chope you get it right gl

9/12 is the answer because 3/4 times 3 each is 9/12