Question 345990
1.{{{F=M-27}}}
In 15 years, Frank will be {{{F+15}}} and his mom will be {{{M+15}}}.
{{{F+15=(1/2)(M+15)}}}
2.{{{2F=M-15}}}
Substitute from eq. 1,
{{{2(M-27)=M-15}}}
{{{2M-54=M-15}}}
{{{M=54-15}}}
{{{M=39}}}
.
.
{{{F=39-27}}}
{{{F=12}}}
.
.
.
Frank is 12 and Mom is 39.