Kathy has three brothers: allan, age 3; George age 7; and juan; age 8. if she doubles allan age subtracts allan age from George age and add Georges age to juans age the sum of the three results equal her friend arrons age A. 18 years
B. 22 years
C. 25 years
D. 30 years​

18 years

C. 25 years

Step-by-step explanation:

From my understanding you were asking to;

Double Allan's age, which is three, so double of his age would be six

Subtract Allan's age, three, from George's age, seven, and you would get four

Add George's age, seven, to Juan's age, eight, and get fifteen

Then you asked to add all the results together which would be;

6 + 4 + 15

That would equal 25 and since we were measuring years it would be 25 years, not just 25.