Question 359368
1.{{{N=10+L}}}
In two years, Nancy will be {{{N+2}}}, Lisa will be {{{L+2}}}
{{{N+2=2(L+2)}}}
Substitute from eq. 1,
{{{10+L+2=2L+4}}}
{{{L+12=2L+4}}}
{{{highlight(L=8)}}}
Then from eq. 1,
{{{N=10+8}}}
{{{highlight(N=18)}}}
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Nancy is 18, Lisa is 8.