
Jesse S. answered 05/07/17
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P is prime and n is a positive integer
P is prime means factor of p is 1 and p
so we can write
n*p=21879 ------> n=21879/p
n+p=2000 ------>n=2000-p
by equating both n
2000 - p = 21879/p
2000p-p2=21879
p2 -2000p=-21879
p2 -2000p + 21879 =0
(p-11)(p-1989)=0
p=11 and p=1989
as 11 is prime no.
p=11
n= 1989