Question 1122659
Let {{{ x }}} = Dan’s age 15 is yrs from now
Now his age is {{{ x - 15 }}}
16 yrs ago, his age was {{{ x - 15 - 16 = x - 31 }}}
They tell you {{{ x - 31 = 7 }}}, so
{{{ x = 38 }}}
He will be 38 in 15 yrs