so if I have 2 apples (me=2)
my friend gave me 4 more (me+4=2+4, me now=6)
so I gave him 3 back (lost 3) (me now-3=6-3, me now=3)
you end up with 3 apples
but,
the question is how many apples are there
find the biggest number
it is 6
there are at least 6 apples (but you end up with 3)