solation of (10- 0.5q1-0.5- λ)/1.10=0 q1+q2=20

solation of

$$(10-0.5q_1-0.5-\lambda)/1.10=0 \qquad q_1+q_2=20\\
(9.5-0.5q_1-\lambda)/1.10=0\qquad q_1+q_2=20\\$$

There is no q2  What are you talking about?