Joe is 5 years older than Sydney. The sum of their ages is 45. What is Sydney’s age?

20 years old

Step-by-step explanation:

Joe = J

Sydney = S

J = 5 + S

J + S = 45

Substitute

5 + S + S = 45

Add

5 + 2S = 45

Subtract 5 from both sides of the equation

2S = 40

Divide both sides of the equation by 2

S = 20

Sydney is 20 years old

Hope this helps :)

by definition, an arc subtended by a central angle of some given measure has the same measure. so .