Question 213562
Let {{{j}}} = number that Jill has
Let {{{k}}} = number that Keesha has
given:
(1) {{{j + k = 17}}}
(2) {{{j = k + 5}}}
---------------
Substitute (2) into (1)
{{{k + 5 + k = 17}}}
{{{2k = 12}}}
{{{k = 6}}}
and
(1) {{{j + k = 17}}}
{{{j + 6 = 17}}}
{{{j = 11}}}
Jill has 11 shells, and Keesha has 6 shells