K \
RIGHT
) \right\} \right]=0.6\] \[3-\left[ 1.6+2.1+K \right]=0.65\] \[1.6+2.1+K=2.35\] \[2.1\div K=2.35-1.\] \[2.1\div K=0.75\] \[\
FRAC
{2.1}{K}=0.75\] \[K=\frac{2.1}{0.75}=\frac{
21
}{7.5}=2.8\]