Answer:
Adam's age is 15, Chris' age is 27
Explanation:
Let Chris' age be C
Let Adam's age be A
C + A = 42 equ1
C = (2×A) - 3 = 2A - 3 equ2
From equ1,
Making C the subject,
C = 42 - A
Substituting the value of C in equ2,
42 - A = 2A - 3
Collect like terms,
42 + 3 = 2A + A
45 = 3A
A = 15
Therefore, Adam's age is 15
Using equ1,
C + A = 42
C + 15 = 42
C = 42 - 15
C = 27
Therefore, Chris' age is 27