Question

Dee is 7 years older than Sydney the sum of their age is 81 what is Sydney’s age

Answer 1

37 years old

Explanation:

If Dee is 7 years older than Sydney we can write an equation using the variables D to represent D and S to represent Sydney.

D + S = 81

Since Dee is 7 years older than Sydney we can say

D = S + 7.

To get S to stand alone replace the D with its equivalent equation.

(S+7) + S = 81.

Solve by subtracting 7 on both sides.

S + S = 74.

Combine like terms to get:

2S = 74.

Now divide by 2 to get S to stand alone.

S = 37

Therefore Sydney is 37 years old.