If, Then, Else problems

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Waz

I am trying a little go at NESTED IF's.

I have this

billy = 20
sam = 10

If billy = 10
If sam = 5
Text 0,130, "Sam and billy are 15 in total"
Else
If billy = 20
If sam = 10
Text 0,130, "same and billy are 30 in total"
Else
If billy = 50
If sam = 50
Text 0,130, "sam and billy are 100 in total"
EndIf
EndIf
EndIf
EndIf
EndIf
EndIf

now if i edit sam and billy varible to higher like 20 for billy and sam 15 then nothing gets printed?

I basicly checked this over with the book I have and its basicly the same but slightly edited....
any help plz

I even tried doing

billy = billy +10
sam = sam +5
but still nowt text comes up stating their age....