Question

ab+ac+a=165

b+c=10

a=?
AJUTOR
10 P

Answer 1

$ab+ac+a=165 \\ b+c=10 \\ a=? \\ ab+ac+a=165 \\ a(b+c)+a=165 \\ 10a+a=165 \\ 11a=165 \\ a=165:11 \\ \boxed{a=15}$

Answer 2

a (b+c+1)=165
a (10+1)=165
11a=165
a=15