Question 150366
Let S be Sue's age, L be Leah's age and J be John's age
Given {{{L = S + 6}}}
{{{J = L + 5}}}
{{{J + S + L = 41}}}

Find Sue's age (S)

{{{J + S + L = 41}}}
{{{(L + 5) + S + (S + 6) = 41}}}
{{{((S+6) + 5) + S + (S + 6) = 41}}}
{{{3S + 17 = 41}}}
{{{3S = 24}}}
{{{S = 8}}}