Answer: Number of stamps Mike and Andrew have 48 and 12 respectively.
Step-by-step explanation:
Since we have given that
Number of stamps Andrew has be 'x'.
Number of stamps Mike has be '4x'.
Mike gives Andrew 8 stamps.
Number of stamps Andrew has 'x+8,
Number of stamps Mike has '4x-8'.
According to question, Mike will have twice as many stamps as Andrew.
Hence, there are 12 stamps Andrew has and there are stamps Mike has.