Question

Alvin is 15 years younger than Elga. The sum of their ages is 35. What is Elga's age?

Answer 1

Elga is 25 and Alvin is 10

Explanation:

25 - 10 is 15

25 + 10 = 35

Answer 2

25

Explanation:

Let A = Alvin's age

and E = Elga's age

We have two conditions:

(1) A = E – 15

(2) A + E = 35 Substitute (1) into (2)

E – 15 + E = 35 Combine like terms

2E – 15 = 35 Add 15 to each side

2E = 50 Divide each side by 2

E = 25