Nina + her 5 friends = 6 people
 Then she has 9 apple to share with her and her friends.
 Let’s calculate how many apple will each people get when they equally divide it with each other:
 => 9 – 6 = 3 
 Thus already have 1 apple each, now, let’s divide the remaining 3 apples
 => 3 / 6 = .5 
 So they have half of apple each. Let’s add 
 => 1 + .5 = 1.5
 Each person will get 1.5 apple.
 => 1.5 * 6 = 9