Question 939343
z and p   ("Zam")


z=p+1  Sam is older.


(z-3)+(p-3)=15.


Order of z and p is not critical without other information.

z+p-6=15
z+p=21
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If sam is older, then p+1+p=21
2p+1=21
p=10 and then z=11.