Question 658387
Add {{{ x }}} years to both their ages
given:
{{{ 31 + x = 2*( 8 + x ) }}}
{{{ 31 + x = 16 + 2x }}}
{{{ x = 31 - 16 }}}
{{{ x = 15 }}}
In 15 years the Mother's age will be twice the Daughter's
check:
In 15 yrs Mother is 31 + 15 = 46
In 15 yrs Daughter is 8 + 15 = 23
46 is twice 23
OK