Devaughn's age is two times sydney's age. the sum of their ages is
78. what is sydney's age?

? yearsold

Sydney is 26 years old. Devaughn's age would be 2 times 26, making him 52. And 52+26=78. If you'd like further explanation as to how I came to this answer, I'd be glad to help. :)

X is Sydney's age
2x is Devaughn's age

x +2x = 78
3x = 78
x = 78/3
x = 26

Sydney is 26 years old

The answer is a 5/20 because if u add all of the marbles there are 20 and there are 5 red marbles so 5/20 is the answer mark as brainliest