If then statements

[SEDOC]

How can I use a If then statement to look at two or more cells in the function before returning a value.

=if(c5="2" and d5="1",175,if(c5="1" and d5="2",225,l5/.9))

I know this isnt right need help please

[Cutter]

=if(and(c5=2,d5=1),175,if(and(c5=1,d5=2),225,L5/.9))