Question 1052770
{{{S=10+B}}}
Next year,
{{{(S+1)=2(B+1)}}}
{{{S+1=2B+2}}}
{{{S-2B=1}}}
Substitute from above,
{{{10+B-2B+1}}}
{{{-B=-9}}}
{{{B=9}}}
So then,
{{{S=10+9}}}
{{{S=19}}}