The absolute value of BOTH of those numbers is ' 1 '.
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Oh ! Wait just a second. Did you mean for the 1 and the -1 to be combined
in some way ? If that's what you had in mind, then you'll have to be more
specific. "And" is no mathematical operation that I know of.
ANSWER
The greatest common factor is

EXPLANATION
We want to find the greatest common factor of

and

The prime factorizations are;

and

The product of the least powers of the common factors is the greatest common factor.
Answer:
12
Step-by-step explanation:
150/200×100%=75%
75% of 200 miles is 150 miles