Alvin is 15 years younger than elga. the sum of their ages is 35. what is elga's age?

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

20 i think

and i think yhu mutiple 6 time 3 and then yhu want to add  two  to 18