Question 1148206
Let {{{ x }}} = the number that Peg has
{{{ x + 7 }}} = the number that Pat has
{{{ x + 7 + 8 }}} = the number that Piper has
-------------------------------------------------
{{{ x + x + 7 + x + 15 = 64 }}}
{{{ 3x + 22 = 64 }}}
{{{ 3x = 42 }}}
{{{ x = 14 }}}
Peg owns 14
------------------
check:
{{{ x + 7 = 21 }}}
{{{ x + 15 = 29 }}}
{{{ 14 + 21 + 29 = 64 }}}
{{{ 64 = 64 }}}
OK