Answer:
25
Step-by-step 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
