I need help and fast!! 20 points if answered! Plz don't just answer to get points!!

Answer:
1) equation relating both
N+F = 19
2)N = 9
Step-by-step explanation:
N+F =15
He folded 6, so F = 6
N = 15 - 6 = 9
Answer:
equation n= 15-f
Step-by-step explanation:
f= already folded
for second question: n=15-6