Question 830309
Let {{{A }}} and {{{B}}} be your numbers.
1.{{{A+7=2B}}}
2. {{{B+20=4A}}}
From eq. 1,
{{{A=2B-7}}}
Substitute this into eq. 2,
{{{B+20=4(2B-7)}}}
{{{B+20=8B-28}}}
{{{7B=48}}}
{{{highlight(B=48/7)}}}
Then from eq. 1,
{{{A=2(48/7)-7}}}
{{{A=96/7-49/7}}}
{{{highlight(A=47/7)}}}