Answer:
b is 10 years old
Explanation:
express a and b in terms of c
given a = b + 2 and b = 2c , then a = 2c + 2
the sum of their ages is then
a + b + c = 27 , that is
2c + 2 + 2c + c = 27
5c + 2 = 27 ( subtract 2 from both sides )
5c = 25 ( divide both sides by 5 )
c = 5
Then
b = 2c = 2 × 5 = 10