Answer:
p = 19
Explanation:
In the first statement,
p = 7
q = 9
The difference between both of the numbers is 2.
So, if q = 21,
q - p = 2
21 - p = 2
21 - 2 = 19.
I TRIED MY BEST, I WAS SO CONFUSED BY THIS PROBLEM, SORRY IF IT'S WRONG
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