If ab-a-b=265
bc-b-c=155
ac-c-a=150
then find a?  Select the correct option
A) 16
B) 17
C) 18
D) 19
E) 20
(A-1)(17-1)=A17-A-17+1=265+1=266..(1)   (17-1)(C-1)=17C-17-C+1=155+1=156..(2)   (C-1)(A-1)=CA-C-A+1=150+1=151..(3)   (1)/(2) gives..(A-1)/(C-1)=266/156..(4)   (3)*(4) gives..(A-1)^2=257.47...A=17.04   Solving other equations..17=17.58 and C=10.4   ANSWER:17
<result>B</result>
If ab-a-b=265
bc-b-c=155
ac-c-a=150
then find a?