Nice riddles

Move just THREE crosses
and flip this triangle upside down?
X
X X
X X X
X X X X

p/s: scroll down for answer..

Answer:

X
X X
X X X
X X X X

Move the X
to underneath the bottom row

then move the X & X
up to each side of the new top line

X X X X
X X X
X X
X